Fedora 35 : The yubikey tool.

Today I tested my old yubikey tool on Fedora 35 and working well.

You can see more info in the documentation area.

[root@fedora mythcat]# dnf install yubikey-manager.noarch
Last metadata expiration check: 0:41:43 ago on Sat 16 Oct 2021 10:46:03 PM EEST.
Dependencies resolved.
================================================================================
 Package                 Arch   Version                            Repo    Size
================================================================================
Installing:
 yubikey-manager         noarch 4.0.7-1.20210908gitbf45dad.fc35    fedora 9.4 k
Installing dependencies:
 libyubikey              x86_64 1.13-16.fc35                       fedora  34 k
 python3-fido2           noarch 0.9.1-4.fc35                       fedora 237 k
 python3-pyscard         x86_64 1.9.7-13.fc35                      fedora 180 k
 python3-yubikey-manager noarch 4.0.7-1.20210908gitbf45dad.fc35    fedora 223 k
 ykpers                  x86_64 1.20.0-8.fc35                      fedora 106 k
Downgrading:
 python3-cryptography    x86_64 3.4.7-5.fc35                       fedora 695 k
 
Transaction Summary
================================================================================
Install    6 Packages
Downgrade  1 Package
 
Total download size: 1.4 M
Is this ok [y/N]: y
Downloading Packages:
(1/7): python3-fido2-0.9.1-4.fc35.noarch.rpm    401 kB/s | 237 kB     00:00     
(2/7): libyubikey-1.13-16.fc35.x86_64.rpm        52 kB/s |  34 kB     00:00     
(3/7): python3-pyscard-1.9.7-13.fc35.x86_64.rpm 808 kB/s | 180 kB     00:00     
(4/7): python3-yubikey-manager-4.0.7-1.20210908 526 kB/s | 223 kB     00:00     
(5/7): yubikey-manager-4.0.7-1.20210908gitbf45d  81 kB/s | 9.4 kB     00:00     
(6/7): ykpers-1.20.0-8.fc35.x86_64.rpm          225 kB/s | 106 kB     00:00     
(7/7): python3-cryptography-3.4.7-5.fc35.x86_64  68 kB/s | 695 kB     00:10     
--------------------------------------------------------------------------------
Total                                           130 kB/s | 1.4 MB     00:11      
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                        1/1  
  Downgrading      : python3-cryptography-3.4.7-5.fc35.x86_64               1/8  
  Installing       : python3-fido2-0.9.1-4.fc35.noarch                      2/8  
  Installing       : python3-pyscard-1.9.7-13.fc35.x86_64                   3/8  
  Installing       : libyubikey-1.13-16.fc35.x86_64                         4/8  
  Installing       : ykpers-1.20.0-8.fc35.x86_64                            5/8  
  Installing       : python3-yubikey-manager-4.0.7-1.20210908gitbf45dad.f   6/8  
  Installing       : yubikey-manager-4.0.7-1.20210908gitbf45dad.fc35.noar   7/8  
  Cleanup          : python3-cryptography-35.0.0-2.fc35.x86_64              8/8  
  Running scriptlet: python3-cryptography-35.0.0-2.fc35.x86_64              8/8  
  Verifying        : python3-cryptography-3.4.7-5.fc35.x86_64               1/8  
  Verifying        : python3-cryptography-35.0.0-2.fc35.x86_64              2/8  
  Verifying        : libyubikey-1.13-16.fc35.x86_64                         3/8  
  Verifying        : python3-fido2-0.9.1-4.fc35.noarch                      4/8  
  Verifying        : python3-pyscard-1.9.7-13.fc35.x86_64                   5/8  
  Verifying        : python3-yubikey-manager-4.0.7-1.20210908gitbf45dad.f   6/8  
  Verifying        : ykpers-1.20.0-8.fc35.x86_64                            7/8  
  Verifying        : yubikey-manager-4.0.7-1.20210908gitbf45dad.fc35.noar   8/8  
 
Downgraded:
  python3-cryptography-3.4.7-5.fc35.x86_64                                       
Installed:
  libyubikey-1.13-16.fc35.x86_64                                                 
  python3-fido2-0.9.1-4.fc35.noarch                                              
  python3-pyscard-1.9.7-13.fc35.x86_64                                           
  python3-yubikey-manager-4.0.7-1.20210908gitbf45dad.fc35.noarch                 
  ykpers-1.20.0-8.fc35.x86_64                                                    
  yubikey-manager-4.0.7-1.20210908gitbf45dad.fc35.noarch                         
 
Complete!

[mythcat@fedora ~]$ ykman  
Usage: ykman [OPTIONS] COMMAND [ARGS]...
 
  Configure your YubiKey via the command line.
 
  Examples:
 
    List connected YubiKeys, only output serial number:
    $ ykman list --serials
 
    Show information about YubiKey with serial number 0123456:
    $ ykman --device 0123456 info
 
Options:
  -d, --device SERIAL             Specify which YubiKey to interact with by
                                  serial number.
  -r, --reader NAME               Use an external smart card reader. Conflicts
                                  with --device and list.
  -l, --log-level [DEBUG|INFO|WARNING|ERROR|CRITICAL]
                                  Enable logging at given verbosity level.
  --log-file FILE                 Write logs to the given FILE instead of
                                  standard error; ignored unless --log-level
                                  is also set.
  --diagnose                      Show diagnostics information useful for
                                  troubleshooting.
  -v, --version                   Show version information about the app
  --full-help                     Show --help, including hidden commands, and
                                  exit.
  -h, --help                      Show this message and exit.
 
Commands:
  info     Show general information.
  list     List connected YubiKeys.
  config   Enable or disable applications.
  fido     Manage the FIDO applications.
  oath     Manage the OATH application.
  openpgp  Manage the OpenPGP application.
  otp      Manage the YubiOTP application.
  piv      Manage the PIV application.

[mythcat@fedora ~]$ ykman info
Device type: YubiKey 4
Serial number:
Firmware version: 4.3.4
Enabled USB interfaces: OTP, FIDO, CCID
 
Applications
FIDO2           Not available    
OTP             Enabled          
FIDO U2F        Enabled          
OATH            Enabled          
YubiHSM Auth    Not available    
OpenPGP         Enabled          
PIV             Enabled  

[mythcat@fedora ~]$ ykman fido list
WARNING: The use of this command is deprecated and will be removed!
Replace with: ykman fido credentials list
 
Error: Credential Management is not supported on this YubiKey.

Fedora 35 : Upgrade from Fedora 34 to Fedora 35 Beta.

Fedora Workstation 35 brings several features worth noting, and testing, for the beta release.

Fedora 35 Workstation Beta includes the newest release of the GNOME desktop environment version 41.

Let's upgrade with these Linux commands:

$ sudo dnf upgrade --refresh
$ sudo dnf autoremove
$ sudo dnf install dnf-plugin-system-upgrade
$ sudo dnf system-upgrade download --releasever=35
$ sudo dnf system-upgrade reboot
$ sudo dnf system-upgrade clean

This is the result:

Fedora 34 : GitKraken tool.

GitKraken is a freemium, cross-platform Git client. Users must pay to use this product commercially, and with large teams. It isn’t open source. That said, it has a free version that anyone can use (for personal, and hobby reasons).

This tool can be found on this website.

I'm trying to install the rpm package, but I got an error about: does not verify: no digest.

I used this mode:

wget https://release.gitkraken.com/linux/gitkraken-amd64.tar.gz
sudo tar -xvzf gitkraken-amd64.tar.gz

This tool work well, see the next picture:

Fedora 34 : Krita Plus 5.0.

Today I tested Krita Plus 5.0 on Fedora distro Linux version 34, see the download webpage.

I also installed the gmic tool and it worked very well.

Here is a screenshot with this new version:

Fedora 34 : Can be better? part 019.

Another way to improve the Fedora 34 is to add the lastes PyQt6 python package into repo.

[root@desk mythcat]# dnf search PyQt6
Last metadata expiration check: 2:03:10 ago on Tue 06 Jul 2021 08:52:41 PM EEST.
No matches found. 

First stable release for PyQt6 was on Jan 2021 by Riverbank Computing Ltd. under GPL or commercial and can be used with Python 3.

Let's install with pip tool:

[mythcat@desk ~]$ /usr/bin/python3 -m pip install --upgrade pip
...
  WARNING: The scripts pip, pip3 and pip3.9 are installed in '/home/mythcat/.local/bin' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, 
  use --no-warn-script-location.
Successfully installed pip-21.1.3
[mythcat@desk ~]$ pip install PyQt6 --user
...

Let's see a simple example with this python package:

import sys
from PyQt6.QtCore import Qt
from PyQt6.QtWidgets import QApplication, QLabel

def main():
    app = QApplication(sys.argv)
    win = QLabel()
    win.resize(640, 498)
    win.setText("Qt is awesome!!!")
    win.show()
    app.exec()

if __name__ == "__main__":
    main()

I tested and run well.

Fedora 34 : Can be better? part 018.

Fedora distro can improuve the LXDE environment.

Let's start this simple tips and tricks that change the size of the window.

You can see the window is blocked by the Task Bar.

You need to open this file named lxde-rc.xml:

[mythcat@desk ~]$ vim ~/.config/openbox/lxde-rc.xml 

Then change these lines of source code save the file and reboot:

<!-- You can reserve a portion of your screen where windows will not cover when they are

 maximized, or when they are initially placed. 

Many programs reserve space automatically, but you can use this in other cases. -->

<margins>

 <top>0</top>

 <bottom>30</bottom>

 <left>0</left>

 <right>0</right>

</margins>

After reboot the result is more good:

Fedora 34 : Install evolution tool.

Evolution is a personal information management application that provides integrated mail, calendaring and address book functionality, see the wiki gnome page.

[root@desk mythcat]# dnf search evolution
Last metadata expiration check: 3:46:10 ago on Sun 27 Jun 2021 10:18:50 AM EEST.
======================= Name Exactly Matched: evolution ========================
evolution.x86_64 : Mail and calendar client for GNOME
... 

[root@desk mythcat]# dnf install evolution.x86_64
Last metadata expiration check: 3:48:05 ago on Sun 27 Jun 2021 10:18:50 AM EEST.
Dependencies resolved.
================================================================================
 Package                  Arch        Version                Repository    Size
================================================================================
Installing:
 evolution                x86_64      3.40.2-1.fc34          updates      3.7 M
Installing dependencies:
 evolution-langpacks      noarch      3.40.2-1.fc34          updates      5.6 M
 highlight                x86_64      3.60-3.fc34            fedora       887 k
 libytnef                 x86_64      1:1.9.3-5.fc34         fedora        39 k

Transaction Summary
================================================================================
Install  4 Packages

Total download size: 10 M
Installed size: 56 M
Is this ok [y/N]: y
...
Installed:
  evolution-3.40.2-1.fc34.x86_64    evolution-langpacks-3.40.2-1.fc34.noarch   
  highlight-3.60-3.fc34.x86_64      libytnef-1:1.9.3-5.fc34.x86_64             

Complete!

The consfiguration of email account is easy.

I used my yahoo account.

The yahoo mail server ask me a token, but I close and I login again and work well.

You can see a video tutorial from my youtube channel.

Fedora 34 : ASP.NET Core application - part 001.

This tutorial is about creating an ASP project on Fedora 34 Linux distro.

Let's create a folder for a new ASP project:

[mythcat@desk ~]$ cd CSharpProjects/
[mythcat@desk CSharpProjects]$ mkdir ASPProjects
[mythcat@desk CSharpProjects]$ cd ASPProjects/
[mythcat@desk ASPProjects]$ dotnet new web -o ASP001
The template "ASP.NET Core Empty" was created successfully.

Processing post-creation actions...
Running 'dotnet restore' on ASP001/ASP001.csproj...
  Determining projects to restore...
  Restored /home/mythcat/CSharpProjects/ASPProjects/ASP001/ASP001.csproj (in 152 ms).
Restore succeeded.

In the ASP001 folder project will run these commands:

[mythcat@desk ASPProjects]$ cd ASP001/
[mythcat@desk ASP001]$ dotnet restore
  Determining projects to restore...
  All projects are up-to-date for restore.
[mythcat@desk ASP001]$ dotnet run
Building...
info: Microsoft.Hosting.Lifetime[14]
      Now listening on: https://localhost:5001
This program will show
info: Microsoft.Hosting.Lifetime[14]
      Now listening on: http://localhost:5000
info: Microsoft.Hosting.Lifetime[0]
      Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
      Hosting environment: Development
info: Microsoft.Hosting.Lifetime[0]
      Content root path: /home/mythcat/CSharpProjects/ASPProjects/ASP001
^Cinfo: Microsoft.Hosting.Lifetime[0]
      Application is shutting down... 

This program will show on browser localhost the text: Hello World!

With the dotnet restore command, we download the necessary dependencies.

It calls into NuGet - .NET package manager to restore the tree of dependencies.

Let's see the files from this project:

[mythcat@desk ASP001]$ ls
appsettings.Development.json  ASP001.csproj  obj	 Properties
appsettings.json	      bin	     Program.cs
[mythcat@desk ASP001]$ cat Program.cs 
using System;
using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.Hosting;

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

if (app.Environment.IsDevelopment())
{
    app.UseDeveloperExceptionPage();
}

app.MapGet("/", (Func<string>)(() => "Hello World!"));

app.Run();
[mythcat@desk ASP001]$ cat ASP001.csproj 
...

This is the most simple tutorial about the ASP project.

Fedora 34 : Test with the new .NET 6.0 SDK.

Now Fedora 34 distro comes integrated in the repo with DotNet 5.

Today I tested DotNet 6.

Let's create a new folder for the .NET 6.0 SDK .

[mythcat@desk ~]$ mkdir -p $HOME/dotnet
[mythcat@desk ~]$ cd dotnet/

First open your browser and download the .NET 6.0 SDK from the official website.

[mythcat@desk dotnet]$ ls
dotnet-sdk-6.0.100-preview.5.21302.13-linux-x64.tar.gz

Use the following commands to extract the SDK and make the commands available at the terminal.

[mythcat@desk dotnet]$ tar zxf dotnet-sdk-6.0.100-preview.5.21302.13-linux-x64.tar.gz  -C $HOME/dotnet
[mythcat@desk dotnet]$ export DOTNET_ROOT=$HOME/dotnet
[mythcat@desk dotnet]$ export PATH=$PATH:$HOME/dotnet

Let's see the content of the dotnet folder:

[mythcat@desk dotnet]$ ls
dotnet							sdk
dotnet-sdk-6.0.100-preview.5.21302.13-linux-x64.tar.gz	sdk-manifests
host							shared
LICENSE.txt						templates
packs							ThirdPartyNotices.txt

Let's run the binary dotnet from this folder:

[mythcat@desk dotnet]$ ./dotnet --version
6.0.100-preview.5.21302.13 

I added to PATH into .bashrc file:

[mythcat@desk dotnet]$cat ~/.bashrc 
export PS1="[\u@\h \W]\$ "
PATH=$PATH:$HOME/dotnet

Fedora 34 : Defragmenting an XFS file system with xfs_fsr.

The xfs_fsr tool improves the organization of mounted filesystems.

The XFS is an extent-based file system, it is usually unnecessary to defragment a whole file system

I can use this command to Defragmenting my XFS file system.

[root@desk mythcat]# xfs_fsr /dev/mapper/fedora-root -v -d
...
set temp attr
DEBUG: fsize=6774 blsz_dio=6656 d_min=512 d_max=2147483136 pgsz=4096
Temporary file has 1 extents (2 in original)
extents before:2 after:1 DONE ino=95047551
ino=95050118
ino=95050118 extents=2 can_save=1 tmp=/.fsr/ag14/tmp10249
orig forkoff 288, temp forkoff 0
orig forkoff 288, temp forkoff 296
orig forkoff 288, temp forkoff 296
orig forkoff 288, temp forkoff 296
orig forkoff 288, temp forkoff 296
orig forkoff 288, temp forkoff 296
orig forkoff 288, temp forkoff 296
orig forkoff 288, temp forkoff 288
set temp attr
DEBUG: fsize=6541 blsz_dio=6144 d_min=512 d_max=2147483136 pgsz=4096
Temporary file has 1 extents (2 in original)
extents before:2 after:1 DONE ino=95050118

This is all about this command.

Fedora 34 : The grubby command line tool.

The grubby command line tool used to configure bootloader menu entries across multiple architectures.

All information can be find with the manual linux commands:

[root@desk mythcat]# man grubby

Let's see some simple examples.

This command can list all the installed kernel:

[root@desk mythcat]# grubby --info=ALL | grep ^kernel
kernel="/boot/vmlinuz-5.12.10-300.fc34.x86_64"
kernel="/boot/vmlinuz-5.12.8-300.fc34.x86_64"
kernel="/boot/vmlinuz-0-rescue-fc76db87af524282b0c7e05a9c5d18f4

To get more details on the installed kernel:

[root@desk mythcat]# grubby --info="/boot/vmlinuz-$(uname -r)"
index=0
kernel="/boot/vmlinuz-5.12.10-300.fc34.x86_64"
args="ro resume=/dev/mapper/fedora-swap rd.lvm.lv=fedora/root rd.lvm.lv=fedora/swap rhgb quiet splash 
acpi_osi=Linux"
root="/dev/mapper/fedora-root"
initrd="/boot/initramfs-5.12.10-300.fc34.x86_64.img"
title="Fedora (5.12.10-300.fc34.x86_64) 34 (MATE-Compiz)"
id="fc76db87af524282b0c7e05a9c5d18f4-5.12.10-300.fc34.x86_64"

Add selinux=0 to the kernel with this tool:

[root@desk mythcat]# grubby --update-kernel ALL --args selinux=0

Let's see if is added:

[root@desk mythcat]# grubby --info="/boot/vmlinuz-$(uname -r)"
index=0
kernel="/boot/vmlinuz-5.12.10-300.fc34.x86_64"
args="ro resume=/dev/mapper/fedora-swap rd.lvm.lv=fedora/root rd.lvm.lv=fedora/swap rhgb quiet splash 
acpi_osi=Linux selinux=0"
root="/dev/mapper/fedora-root"
initrd="/boot/initramfs-5.12.10-300.fc34.x86_64.img"
title="Fedora (5.12.10-300.fc34.x86_64) 34 (MATE-Compiz)"
id="fc76db87af524282b0c7e05a9c5d18f4-5.12.10-300.fc34.x86_64"

Remove the selinux=0 option from the bootloader with this tool:

[root@desk mythcat]# grubby --update-kernel ALL --remove-args selinux

Let's see if is removed:

[root@desk mythcat]# grubby --info="/boot/vmlinuz-$(uname -r)"
index=0
kernel="/boot/vmlinuz-5.12.10-300.fc34.x86_64"
args="ro resume=/dev/mapper/fedora-swap rd.lvm.lv=fedora/root rd.lvm.lv=fedora/swap rhgb quiet splash 
acpi_osi=Linux"
root="/dev/mapper/fedora-root"
initrd="/boot/initramfs-5.12.10-300.fc34.x86_64.img"
title="Fedora (5.12.10-300.fc34.x86_64) 34 (MATE-Compiz)"
id="fc76db87af524282b0c7e05a9c5d18f4-5.12.10-300.fc34.x86_64"

You can see is removed.

Get the index number of all the installed kernels:

[root@desk mythcat]# grubby --info=ALL | grep -E "^kernel|^index"
index=0
kernel="/boot/vmlinuz-5.12.10-300.fc34.x86_64"
index=1
kernel="/boot/vmlinuz-5.12.8-300.fc34.x86_64"
index=2
kernel="/boot/vmlinuz-0-rescue-fc76db87af524282b0c7e05a9c5d18f4"

I can set the default kernel by index with this tool:

[root@desk mythcat]# grubby --set-default-index=1

These are not all features of this command.

Fedora 34 : The uresourced resource tool.

The uresourced tool is a daemon that will give resource allocations to active graphical users.

You can enable easy with systemctl command:

[root@desk mythcat]# systemctl status uresourced
○ uresourced.service - User resource assignment daemon
     Loaded: loaded (/usr/lib/systemd/system/uresourced.service; disabled; vend>
     Active: inactive (dead)

[root@desk mythcat]# systemctl enable uresourced
Created symlink /etc/systemd/system/user@.service.wants/uresourced.service → 
/usr/lib/systemd/system/uresourced.service.
[root@desk mythcat]# systemctl start  uresourced
[root@desk mythcat]# systemctl status uresourced
● uresourced.service - User resource assignment daemon
...

Fedora 34 : Linux tool to prevent OOM Killer.

The OOM Killer or Out of Memory Killer is a process that the Linux kernel employs when the system is critically low on memory

This situation occurs because processes on the server are consuming a large amount of memory, and the system requires more memory for its processes and to allocate to other processes.

A simple example with OOM Killer: if will swap out the desktop environment, drop the whole page cache, and empty every buffer before it will ultimately kill a process.

This tool named earlyoom is a simple, stable, and tiny OOM prevention daemon.

That is written in C and is the best choice for old servers.

It has minimum dependencies and can work with the oldest kernels.

The earlyoom checks the amount of available memory and free swap up.

This command causes memory consumption, and the process will exits before OOM occurs if this tool works.

See also this Fedora webpage.

The tool can be installed with the following command:

[root@desk mythcat]# dnf install earlyoom
Last metadata expiration check: 0:38:00 ago on Sun 13 Jun 2021 11:38:22 AM EEST.
Package earlyoom-1.6.2-3.fc34.x86_64 is already installed.
Dependencies resolved.
Nothing to do.
Complete!

You can see all options for this tool with this command:

[root@desk mythcat]# earlyoom -h
earlyoom 1.6.2
Usage: earlyoom [OPTION]...

Then the service is activated with:

[root@desk mythcat]# systemctl enable --now earlyoom

My configuration file for this tool is:

[root@desk mythcat]# vim  /etc/default/earlyoom

EARLYOOM_ARGS="-r 1 -m 1 -s 5 -M 1514244 --prefer '^Web Content$' 
--avoid '^(dnf|packagekitd|gnome-shell|gnome-session-c|gnome-session-b|lightdm|
sddm|sddm-helper|gdm|gdm-wayland-ses|gdm-session-wor|gdm-x-session|Xorg|Xwayland|
systemd|systemd-logind|dbus-daemon|dbus-broker|cinnamon|cinnamon-sessio|kwin_x11|
kwin_wayland|plasmashell|ksmserver|plasma_session|startplasma-way|xfce4-session|
mate-session|marco|lxqt-session|openbox|cryptsetup)$'"

You can check the status of the service to be active:

[root@desk mythcat]# systemctl status earlyoom
...
Active: active (running) since 
... 

You can test it easily with these commands:

[root@desk mythcat]# sudo swapoff -a
[root@desk mythcat]# tail /dev/zero
Terminated

The process tail must occupy the entire available RAM on the system, this will low your system and after the earlyoom tool freeing the RAM all works well.

To see the tool on work, use the command:

[root@desk mythcat]# earlyoom 
earlyoom 1.6.2
mem total: 7899 MiB, swap total: 7898 MiB
sending SIGTERM when mem <= 10.00% and swap <= 10.00%,
        SIGKILL when mem <=  5.00% and swap <=  5.00%
mem avail:  4742 of  7899 MiB (60.04%), swap free: 7898 of 7898 MiB (100.00%)
mem avail:  4742 of  7899 MiB (60.04%), swap free: 7898 of 7898 MiB (100.00%)
mem avail:  4751 of  7899 MiB (60.15%), swap free: 7898 of 7898 MiB (100.00%)
mem avail:  4754 of  7899 MiB (60.19%), swap free: 7898 of 7898 MiB (100.00%)

Fedora 34 : Fix conflicts are between the version of the packages.

You can have conflicts are between the version of the packages, see this example:

[root@desk mythcat]# dnf update --refresh
file /usr/share/doc/gstreamer1-plugins-good/README from install of 
gstreamer1-plugins-good-1.19.1-1.fc34.i686 conflicts with file from package 
gstreamer1-plugins-good-1.18.4-2.fc34.x86_64

This command will fix conflicts are between the version of the packages:

[root@desk mythcat]# dnf remove --duplicates
...
 gstreamer1                          i686    1.19.1-1.fc34       updates  1.4 M
Reinstalling:
 gst-editing-services                x86_64  1.19.1-1.fc34       updates  608 k
     replacing  gst-editing-services.x86_64 1.18.4-1.fc34
 gstreamer1                          x86_64  1.19.1-1.fc34       updates  1.3 M
     replacing  gstreamer1.x86_64 1.18.4-2.fc34
 gstreamer1-plugins-bad-free         x86_64  1.19.1-1.fc34       updates  2.6 M
     replacing  gstreamer1-plugins-bad-free.x86_64 1.18.4-1.fc34
 gstreamer1-plugins-bad-free-extras  x86_64  1.19.1-1.fc34       updates  422 k
     replacing  gstreamer1-plugins-bad-free-extras.x86_64 1.18.4-1.fc34
 gstreamer1-plugins-ugly-free        x86_64  1.19.1-1.fc34       updates  103 k
     replacing  gstreamer1-plugins-ugly-free.x86_64 1.18.4-1.fc34
 gucharmap                           x86_64  13.0.8-1.fc34       updates  514 k
     replacing  gucharmap.x86_64 13.0.7-1.fc34
 gucharmap-libs                      x86_64  13.0.8-1.fc34       updates  1.2 M
     replacing  gucharmap-libs.x86_64 13.0.7-1.fc34
 kernel-headers                      x86_64  5.12.9-300.fc34     updates  1.2 M
     replacing  kernel-headers.x86_64 5.12.5-300.fc34
...

The next command will update you Linux distro:

[root@desk mythcat]# dnf update --refresh
Copr repo for dotnet owned by @dotnet-sig       5.1 kB/s | 3.3 kB     00:00    
Adobe Systems Incorporated                      7.6 kB/s | 2.9 kB     00:00    
Fedora 34 - x86_64                               58 kB/s |  26 kB     00:00    
Fedora 34 - x86_64 - Updates                     41 kB/s |  23 kB     00:00    
google-chrome                                   9.0 kB/s | 1.3 kB     00:00    
RPM Fusion for Fedora 34 - Free                  16 kB/s | 7.9 kB     00:00    
RPM Fusion for Fedora 34 - Free - Updates        18 kB/s | 7.9 kB     00:00    
RPM Fusion for Fedora 34 - Nonfree               21 kB/s | 8.0 kB     00:00    
RPM Fusion for Fedora 34 - Nonfree - Updates     13 kB/s | 8.0 kB     00:00    
The Zeek Network Security Monitor. (Fedora_33)  6.6 kB/s | 1.7 kB     00:00    
Visual Studio Code                              6.0 kB/s | 3.0 kB     00:00    
WineHQ packages                                 9.3 kB/s | 3.2 kB     00:00    
Dependencies resolved.
...
 gstreamer1-plugins-good-1.19.1-1.fc34.i686  
...

Fedora 34 : Programming with the ncurses library - part 003.

This is a simple example with ncurses library to see how can define an array and used with random colors:

This example is build with this command:

[mythcat@desk ncursesProject]$ gcc test_008.c -o test_008 -lncurses

This is source code:

#include <ncurses.h>
#include <stdlib.h> 

int main(void) {
    
    initscr();
    
    start_color();
    
    char colors[8][20] = {
    "COLOR_BLACK",
    "COLOR_RED",
    "COLOR_GREEN",
    "COLOR_YELLOW",
    "COLOR_BLUE",
    "COLOR_MAGENTA",
    "COLOR_CYAN",
    "COLOR_WHITE"
    };
    
    int n;
    for ( n=0 ; n<16 ; ++n )
    {
        int aleator1 = rand() % 256 + 1;
        int result1 = *colors[aleator1];
        int aleator2 = rand() % 256 + 1;
        int result2 = *colors[aleator2];
        //printw("%d",result1);
        init_pair(n, result1, result2);
        attron(COLOR_PAIR(n));
        printw("Hello word!\n");
    }
    
    refresh();

    getch();

    endwin();
}

Fedora 34 : Neix feed reader.

neix is a simple, work in progress terminal feed reader for all common RSS/Atom feeds on the web out there.

Let't install from the GitHub repository.

[mythcat@desk ~]$ git clone https://github.com/tomschwarz/neix.git  
Cloning into 'neix'...
remote: Enumerating objects: 2574, done.
remote: Counting objects: 100% (365/365), done.
remote: Compressing objects: 100% (274/274), done.
remote: Total 2574 (delta 189), reused 198 (delta 77), pack-reused 2209
Receiving objects: 100% (2574/2574), 26.07 MiB | 6.27 MiB/s, done.
Resolving deltas: 100% (1529/1529), done.
[mythcat@desk ~]$ cd neix
[mythcat@desk neix]$ cmake .
-- The C compiler identification is GNU 11.1.1
-- The CXX compiler identification is GNU 11.1.1
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
...
-- Found Curses: /usr/lib64/libncursesw.so  
-- Configuring done
-- Generating done
-- Build files have been written to: /home/mythcat/neix
[mythcat@desk neix]$ make 
Scanning dependencies of target neixParser
[  5%] Building CXX object CMakeFiles/neixParser.dir/src/parser/FactoryParser.cpp.o
...
[ 89%] Built target neixFeed
Scanning dependencies of target neix
[ 94%] Building CXX object CMakeFiles/neix.dir/src/main.cpp.o
[100%] Linking CXX executable bin/neix
[100%] Built target neix
[mythcat@desk neix]$ sudo make install
[sudo] password for mythcat: 
[ 26%] Built target neixParser
[ 42%] Built target neixConfig
[ 57%] Built target neixApplication
[ 73%] Built target neixHelper
[ 89%] Built target neixFeed
[100%] Built target neix
Install the project...
-- Install configuration: ""
-- Installing: /usr/local/bin/neix
-- Installing: /usr/local/share/man/man1/neix.1
-- Installing: /usr/local/share/neix/neix.conf
-- Installing: /usr/local/share/neix/feeds.conf

Let's run it:

[mythcat@desk neix]$ neix 
[neix] Starting version v0.1.5
[neix] Loading configuration files
[neix] Loading feeds 
[neix] Launch TUI 

Use feeds.conf to set the list of feeds you want to read.

This is a screenshot with the result of the build:

Fedora 34 : Upgrade to the last version Fedora 34 Linux distro.

Today I upgraded from the fedora 33 version to the new Fedora 34 Linux distro version.

Here are the commands I used to upgrade this Linux distro:

[root@desk mythcat]# dnf upgrade 
[root@desk mythcat]# dnf --refresh upgrade
[root@desk mythcat]# dnf system-upgrade reboot

The whole process will require a restart and then continue with the following commands:

[root@desk mythcat]# dnf install dnf-plugin-system-upgrade --best
[root@desk mythcat]# dnf system-upgrade download --refresh --releasever=34 --allowerasing --skip-broken
[root@desk mythcat]# dnf system-upgrade reboot
[root@desk mythcat]# rpm --rebuilddb
[root@desk mythcat]# dnf distro-sync --setopt=deltarpm=0
[root@desk mythcat]# dnf install rpmconf
[root@desk mythcat]# rpmconf -a
[root@desk mythcat]# reboot

You can find this version on the official webpage.

Fedora 33 : Programming with the ncurses library - part 002.

Another example with this library, see the screenshot:

#include <ncurses.h&gt 

WINDOW *win;
int startx, starty, width, height;
int cport;


WINDOW *makewin(int h, int w, int y, int x)
{
    WINDOW *lwin;

    lwin = newwin(h, w, y, x);
    box(lwin, 0 , 0);
    wrefresh(lwin);

    return lwin;
}

void dewin(WINDOW *lwin)
{
    wborder(lwin, ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ');
    wrefresh(lwin);
    delwin(lwin);
}

void getInput(){
    win = makewin(height, width, starty, startx);
    wbkgd(win, COLOR_PAIR(1));
    mvwprintw(win, 0, 8, "Question 1 : ");
    mvwprintw(win, 2, 4, "What is your age?");
    mvwprintw(win, 3, 4, "dd/mm/yy:");
    wrefresh(win);
    wscanw(win, "%d", &cport);
}

int main()
{
    initscr();
    cbreak();
    keypad(stdscr, TRUE);
    start_color();
    init_pair(1,COLOR_WHITE, COLOR_BLACK);
    init_pair(2,COLOR_WHITE, COLOR_BLUE);
    bkgd(COLOR_PAIR(2));
    refresh();
    
    height = 6;
    width = 30;
    starty = (LINES - height) / 2;
    startx = (COLS - width) / 2;
    
    getInput();
    getch();

    dewin(win);
    endwin();
    return 0;
}

Fedora 33 : Programming with the ncurses library - part 001.

I started learning C and C ++ many years ago. Around 2004, the virtualization and S.D.K. class system for the Windows operating system confused me and was not to my advantage. Later I realized that it is more advantageous and faster to create your own tools with other programming languages. It turned out that I'm right and today I'm going to show you how simple it is to use C programming on the Linux Fedora 33 distro.

This library is easy to install on the Fedora Linux distro:

[root@desk mythcat]# dnf install ncurses-devel
Last metadata expiration check: 2:33:29 ago on Sun 23 May 2021 07:15:17 PM EEST.
Package ncurses-devel-6.2-3.20200222.fc33.x86_64 is already installed.
Package ncurses-devel-6.2-3.20200222.fc33.i686 is already installed.
Dependencies resolved.
Nothing to do.
Complete!

I created a folder and with the vim editor, I created my file called test_001.c for the first test.

[mythcat@desk ~]$ mkdir ncursesProject
[mythcat@desk ~]$ cd ncursesProject/
[mythcat@desk ncursesProject]$ vim test_001.c

This is the content to initiate and display a simple text with this library:

#include <ncurses.h>
 
int main(void){ 
        initscr();                      /* start curses mode */
        printw("Hello World !");        /* print Hello World */
        refresh();                      /* send to the real screen */
        getch();                        /* wait for user input */
        endwin();                       /* end curses mode */
        return 0;
} 

I used cc and gcc commands for C compilers to test this example and it works great:

[mythcat@desk ncursesProject]$ cc -o test_001 test_001.c -lncurses
[mythcat@desk ncursesProject]$ ls -l
total 32
-rwxr-xr-x 1 mythcat mythcat 25312 May 23 22:14 test_001
-rw-r--r-- 1 mythcat mythcat   386 May 23 22:14 test_001.c
[mythcat@desk ncursesProject]$ ./test_001 
[mythcat@desk ncursesProject]$ gcc -o test_001_gcc test_001.c -lncurses
[mythcat@desk ncursesProject]$ ./test_001_gcc 

#include <ncurses.h>

int main() { 
    // create the pointer to the window
    WINDOW *w;
    // define the data
    char list[4][8] = { "","Festila", "George", "Catalin"};
    char item[8];
    int ch, i = 0, width = 8;
    initscr(); // initialize Ncurses
    // create the new window with ncurses
    w = newwin( 6, 11, 0, 0 ); 
    box( w, 0, 0 ); // sets default borders for the window
    // now print all the menu items and highlight the first one
    for(i=0; i<4; i++) 
        {
        if( i != 0 ) 
            // highlights the first item.
            wattron( w, A_STANDOUT ); 
        else
            // highlights the next item.
            wattroff( w, A_STANDOUT );
            sprintf(item, "%-8s",  list[i]);
            mvwprintw( w, i+1, 2, "%s", item );
            //wrefresh( w );
        }
        wrefresh( w ); // update the terminal screen
        i = 0;
        noecho(); // disable echoing of characters on the screen
        keypad( w, TRUE ); // enable keyboard input for the window.
        curs_set(0); // hide the default screen cursor.
        
    // get the input if is not q key presed then run
    while(( ch = wgetch(w)) != 'q')
    { 
        // right pad with spaces to make the items appear with even width.
        sprintf(item, "%-8s",  list[i]); 
        mvwprintw( w, i+1, 2, "%s", item ); 

        // use a variable to increment or decrement the value based on the input.
        switch( ch ) 
        {
            case KEY_UP:
            i--; // increment 
            // stop the number of count list items -1
            i = ( i<0 ) ? 3 : i;
            break;
            case KEY_DOWN:
            i++; // increment
            // stop the number of count list items 
            i = ( i>2 ) ? 3 : i;
            break;
        }
    
        // now highlight the next item in the list.
        wattron( w, A_STANDOUT );
        sprintf(item, "%-8s",  list[i]);
        mvwprintw( w, i+1, 2, "%s", item);
        wattroff( w, A_STANDOUT );
    }
    // delete window
    delwin( w );
    // stop the window
    endwin();
}

This is the result:

Fedora 33 : Wordpress application desktop by Automattic tested on linux.

This application come for Android , Desktop and Mobile.

You can see this application on this website.

This is an screenshot with the application run it on Fedora Linux distro:

Download it unarchive and used like this:

[mythcat@desk ~]$ cd wordpress.com-linux-x64-6.14.0/
[mythcat@desk wordpress.com-linux-x64-6.14.0]$ ls -la
total 176264
drwxrwxrwx    5 mythcat mythcat      4096 Apr 30 14:23 .
drwx------. 104 mythcat mythcat     12288 May 23 12:29 ..
-rwxrwxrwx    1 mythcat mythcat    124662 Apr 30 14:23 chrome_100_percent.pak
-rwxrwxrwx    1 mythcat mythcat    187289 Apr 30 14:23 chrome_200_percent.pak
-rwxrwxrwx    1 mythcat mythcat   4743960 Apr 30 14:23 chrome-sandbox
-rwxrwxrwx    1 mythcat mythcat  10527632 Apr 30 14:23 icudtl.dat
-rwxrwxrwx    1 mythcat mythcat    249240 Apr 30 14:23 libEGL.so
-rwxrwxrwx    1 mythcat mythcat   3064616 Apr 30 14:23 libffmpeg.so
-rwxrwxrwx    1 mythcat mythcat   6990656 Apr 30 14:23 libGLESv2.so
-rwxrwxrwx    1 mythcat mythcat   3908248 Apr 30 14:23 libvk_swiftshader.so
-rwxrwxrwx    1 mythcat mythcat   6710080 Apr 30 14:23 libvulkan.so
-rwxrwxrwx    1 mythcat mythcat      1060 Apr 30 14:23 LICENSE.electron.txt
-rwxrwxrwx    1 mythcat mythcat   4562357 Apr 30 14:23 LICENSES.chromium.html
drwxrwxrwx    2 mythcat mythcat      4096 Apr 30 14:23 locales
drwxrwxrwx    3 mythcat mythcat        17 Apr 30 14:23 resources
-rwxrwxrwx    1 mythcat mythcat   5035565 Apr 30 14:23 resources.pak
-rwxrwxrwx    1 mythcat mythcat     51449 Apr 30 14:23 snapshot_blob.bin
drwxrwxrwx    2 mythcat mythcat        43 Apr 30 14:23 swiftshader
-rwxrwxrwx    1 mythcat mythcat    172276 Apr 30 14:23 v8_context_snapshot.bin
-rwxrwxrwx    1 mythcat mythcat       107 Apr 30 14:23 vk_swiftshader_icd.json
-rwxrwxrwx    1 mythcat mythcat 134100640 Apr 30 14:23 wpcom
[mythcat@desk wordpress.com-linux-x64-6.14.0]$ ./wpcom 
{"name":"calypso","hostname":"desk","pid":9931,"reqId":"066e63b4-d04c-4210-af52-6419e4a156fb","level":30,
"method":"GET","status":200,"length":"12940","url":"/post/null","duration":66.718,
"httpVersion":"1.1","env":"desktop","userAgent":"Chrome 87","rawUserAgent":"Mozilla/5.0 (X11; Linux x86_64)
AppleWebKit/537.36 (KHTML, like Gecko) WordPressDesktop/6.14.0 Chrome/87.0.4280.67 Electron/11.0.4 
Safari/537.36","remoteAddr":"127.0.0.1","msg":"request finished","time":"2021-05-23T09:48:44.683Z","v":0}
{"name":"calypso","hostname":"desk","pid":9931,"reqId":"6da5223a-07e0-4202-8ab0-e28940a54fbc","level":30, ...

I send my issue on GitHub for this application.

... more information on the official blog ...