Regular expressions can be used in the gedit editor using the Find and Replace option with the regular expressions checkbox selected. This can be used to remove empty lines from source code, remove comment lines, replace indexing - if using Python scripts, or replace content. Here's an example of how to remove empty lines from a text using regular expressions:
tutorials, tips, tricks, commands, programming, linux, windows, database, sql, python, programming language, Fedora, drawing, painting, tutorial, tutorials
Sunday, May 21, 2023
Friday, May 19, 2023
Fedora 39 : Using a stick or hard disk created in Windows.
When attached to USB, Linux distribution cannot access it.
Install these packages with the DNF utility.
sudo dnf install ntfs-3g
sudo dnf install ntfsfix
Use these commands to create a folder where it will be mounted and test if it can be mounted and where it is viewed :
sudo mkdir /mnt/mydrive
sudo mount -t ntfs-3g /dev/sdb1 /mnt/mydrive
dmesg| grep usb
sudo mount /dev/sdb /mnt/mydrive
df -h
Fix errors with this command
sudo umount /dev/sdb1
sudo ntfsfix /dev/sdb1
It resumes the operation of mounting it in the folder named /mnt/mydrive:
sudo mount -t ntfs-3g /dev/sdb1 /mnt/mydrive
This command will mount as a superuser but can be modified as a normal user.
Create a USB folder into your home folder as normal user.
You can use these commands to use your files like a normal user:
[mythcat@fedora ~]$ sudo mount -t ntfs-3g /dev/sdb1 ~/USB
[sudo] password for mythcat:
...
[mythcat@fedora ~]$ sudo umount /dev/sdb1
Monday, May 8, 2023
Fedora 39 : The vifm file manager ...
My monitor broke a few days ago so i'm using an old laptop. Website posts will be less frequent.
You can use the vifm file manager in Fedora 39 easy.
Use the DNF command tool to install it.
[root@fedora mythcat]# dnf install vifm
See the result of this file manager:
Monday, May 1, 2023
Fedora 39 : GPT on linux terminal.
Posted by
Cătălin George Feștilă
Labels:
2023,
Artificial intelligence,
ChatGPT,
Fedora,
Fedora 39,
go,
tgpt,
tutorial,
tutorials
Saturday, April 29, 2023
Fedora 39 : Fedora 39 Cinnamon environment pre-release - upgrade.
Today I tested the new version of fedora 39 and it worked very well.
If you want to upgrade Fedora using the DNF system upgrade then you can find all information on the official webpage.
You can try a Fedora 39 Cinnamon environment pre-release from this website.
A very good feature comes with this new command remove-retired-packages.
This allow you to keep the all packages with update.
Posted by
Cătălin George Feștilă
Labels:
2023,
dnf,
Fedora,
Fedora 39,
linux,
remove-retired-packages,
tutorial,
tutorials
Thursday, February 2, 2023
Fedora 38 : LibreOffice with new features.
LibreOffice is a free and powerful office suite, and a successor to OpenOffice.org (commonly known as OpenOffice).
Its clean interface and feature-rich tools help you unleash your creativity and enhance your productivity... see the official website.
I install easy with DNF tool on Fedora 38:
[root@fedora mythcat]# dnf install libreoffice.x86_64
Last metadata expiration check: 1:13:09 ago on Thu 02 Feb 2023 05:03:42 PM EET.
Dependencies resolved.
================================================================================
Package Arch Version Repo Size
================================================================================
Installing:
libreoffice x86_64 1:7.5.0.2-2.fc38 rawhide 15 k
Installing dependencies:
apache-commons-collections noarch 3.2.2-29.fc38 rawhide 531 k
apache-commons-lang3 noarch 3.12.0-7.fc38 rawhide 559 k
firebird x86_64 4.0.2.2816-4.fc38 rawhide 5.1 M
firebird-utils x86_64 4.0.2.2816-4.fc38 rawhide 2.1 M
flute noarch 1.3.0-31.OOo31.fc38 rawhide 64 k
javapackages-tools noarch 6.1.0-7.fc38 rawhide 37 k
libbase noarch 1.1.3-36.fc38 rawhide 130 k
libfbclient2 x86_64 4.0.2.2816-4.fc38 rawhide 860 k
libfonts noarch 1.1.3-40.fc38 rawhide 177 k
libformula noarch 1.1.3-37.fc38 rawhide 340 k
libib-util x86_64 4.0.2.2816-4.fc38 rawhide 12 k
liblayout noarch 0.2.10-30.fc38 rawhide 654 k
libloader noarch 1.1.3-38.fc38 rawhide 130 k
libreoffice-base x86_64 1:7.5.0.2-2.fc38 rawhide 2.3 M
libreoffice-draw x86_64 1:7.5.0.2-2.fc38 rawhide 23 k
libreoffice-math x86_64 1:7.5.0.2-2.fc38 rawhide 20 k
librepository noarch 1.1.3-37.fc38 rawhide 68 k
libserializer noarch 1.1.2-36.fc38 rawhide 36 k
ongres-scram noarch 2.1-8.fc38 rawhide 65 k
ongres-scram-client noarch 2.1-8.fc38 rawhide 24 k
ongres-stringprep noarch 1.1-6.fc38 rawhide 74 k
pentaho-libxml noarch 1.1.3-36.fc38 rawhide 101 k
pentaho-reporting-flow-engine noarch 1:0.9.4-29.fc38 rawhide 285 k
postgresql-jdbc noarch 42.5.1-2.fc38 rawhide 836 k
sac noarch 1.3-41.fc38 rawhide 19 k
velocity noarch 1.7-40.fc38 rawhide 386 k
Transaction Summary
================================================================================
Install 27 Packages
Total download size: 15 M
Installed size: 46 M
Is this ok [y/N]: y
...
This software works good on my old laptop:
You can see a video from the official youtube channel with the new features:
Posted by
Cătălin George Feștilă
Labels:
2023,
2023 news,
Fedora,
Fedora 38,
LibreOffice,
linux tools,
news,
tool,
tutorial,
tutorials
Tuesday, January 31, 2023
Fedora 37 : Lite editor.
lite is a lightweight text editor written mostly in Lua — it aims to provide something practical, pretty, small and fast, implemented as simply as possible; easy to modify and extend, or to use without doing either.
You can find this project on GitHub.
I install with DNF tool:
# dnf install lite-xl.x86_64
...
Installed:
lite-xl-2.1.1-2.fc38.x86_64
Complete!
... and works very well:
Posted by
Cătălin George Feștilă
Labels:
2022,
dnf,
Fedora,
Fedora 37,
linux,
linux tools,
lite,
tutorial,
tutorials
Monday, December 26, 2022
Fedora 37 : SeLinux alert detection from Trend Micro HouseCall.
If you use the tool from Trend Micro HouseCall for Home Networks, then it is possible that the SELinux tool from Fedora Linux will warn you with an alert.
It can be easily fixed with the following commands.
[root@fedora mythcat]# ausearch -c 'journal-offline' --raw | audit2allow -M my-journaloffline
******************** IMPORTANT ***********************
To make this policy package active, execute:
semodule -i my-journaloffline.pp
[root@fedora mythcat]# semodule -X 300 -i my-journaloffline.pp
libsemanage.semanage_get_lock: Could not get direct transaction lock at /var/lib/selinux/targeted/semanage.trans.LOCK. (Resource temporarily unavailable).
Because I got an access error to the resource, I used some Linux commands that checked the status of my selinux, I searched and stopped the process that doesn't let me access the resource and restarted the command:
[root@fedora mythcat]# cat /etc/selinux/config
SELINUX=enforcing
# SELINUXTYPE= can take one of these three values:
# targeted - Targeted processes are protected,
# minimum - Modification of targeted policy. Only selected processes are protected.
# mls - Multi Level Security protection.
SELINUXTYPE=targeted
[root@fedora mythcat]# ps aux | grep semodule
root 3974 4.2 5.2 211904 209952 pts/0 T 13:29 0:17 semodule -X 300 -i my-journaloffline.pp
root 4032 0.0 0.0 222424 2288 pts/0 S+ 13:36 0:00 grep --color=auto semodule
[root@fedora mythcat]# kill -9 3974
[root@fedora mythcat]# semodule -X 300 -i my-journaloffline.pp
[1]+ Killed semodule -X 300 -i my-journaloffline.pp
[root@fedora mythcat]# semodule -X 300 -i my-journaloffline.pp
This is how the Selinux alert appears in the environment of the Fedora 37 Linux distribution.
Posted by
Cătălin George Feștilă
Labels:
2022,
antivirus,
Fedora,
Fedora 37,
linux,
linux tools,
selinux
Saturday, November 19, 2022
Fedora 37 : Vala development in Fedora 37.
Yesterday I tested the Vala programming language on the Fedora 37 linux distribution. The basic idea was that most linux distribution environments use the GTK+ toolkit that Gnome developed. Development with GTK+ can be done with various programming languages: c, python, rust... The main reason why I tested the implementation of the Vala programming language was that Gnome developed it.
For the installation, I used the DNF utility with the following commands to install the packages necessary for the operation of the development in Vala
$sudo dnf groupinstall "Development Tools" "Development Libraries"
$ sudo dnf install vala
The first command installs the tools that are essential to perform tasks such as installing packages from source code.
The second command only installs the Vala package.
To test the written program we will need to use the Valac compiler and then run it as a simple executable in Linux.
$valac --pkg gtk+-3.0 test.vala
$ ./test
(test:6198): GLib-GObject-CRITICAL **: 14:34:11.454: g_value_set_boxed: assertion 'G_VALUE_HOLDS_BOXED (value)' failed
The error is about the implementation of Vala in Fedora, I don't have an answer of this but in other Linux distributions this is not show.
If you want to use WebKit2GTK+ Extensions then you need to compile it.
valac test.vala --pkg gtk+-3.0 --pkg webkit2gtk-4.0
Is a more easy way to developm application but you need to know well how to deal with GTK and GObject structure.
Tuesday, September 20, 2022
News: Fedora 37 Beta Available.
The Fedora development team announced the beta for version 37 of the open-source operating system has been released on time on September 13, 2022.
This was announced on Fedora Hyperkitty
If you want to test the new beta of Fedora 37, the default x86_64 version can be downloaded from the official Fedora download server.
You will see this comes with many of changes.
Fedora 37 : Use radiotray-ng to simple radio player.
Radiotray-NG is a simple radio player for Ubuntu that runs from the system tray.
You can use this command to install the package.
dnf install radiotray-ng
After installation, you will see an icon on the tray area.
Use this to select the radio and this will play it.
The project can be found on GitHub.
.
Posted by
Cătălin George Feștilă
Labels:
2022,
dnf,
Fedora,
Fedora 37,
linux,
linux tools,
radiotray-ng
Saturday, September 10, 2022
Fedora 37 : Starting with the conda tool.
In this tutorial, I will show the first steps for working with conda tool on Fedora 37.
Conda is an open-source package management system and environment management system that runs on Windows, macOS, Linux, and z/OS. Conda quickly installs, runs, and updates packages and their dependencies. Conda easily creates, saves, loads, and switches between environments on your local computer. It was created for Python programs, but it can package and distribute software for any language., see the official webpage.
I used the DNF tool to install this tool.
[root@fedora mythcat]# dnf install conda
By default, Conda is configured to activate the base environment when I open a fresh terminal session and you can set it to false.
[mythcat@fedora ~]$ conda config --set auto_activate_base false
For the changes to be applied, run the source command with the .bashrc file as an argument.
[mythcat@fedora ~]$ source ~/.bashrc
After installation, the conda can be activated with the base environment.
[mythcat@fedora ~]$ conda activate
(base) [mythcat@fedora ~]$ conda deactivate
[mythcat@fedora ~]$
Let's start a new project environment named test001 with this command:
[mythcat@fedora ~]$ conda create -n test001 python=3.9
...
zlib pkgs/main/linux-64::zlib-1.2.12-h5eee18b_3
Proceed ([y]/n)? y
Downloading and Extracting Packages
libffi-3.3 | 50 KB | ##################################### | 100%
...
setuptools-63.4.1 | 1.1 MB | ##################################### | 100%
Preparing transaction: done
Verifying transaction: done
Executing transaction: done
#
# To activate this environment, use
#
# $ conda activate test001
#
# To deactivate an active environment, use
#
# $ conda deactivate
The next step is to activate this with the next command and list installed packages in a conda environment.
[mythcat@fedora ~]$ conda activate test001
(test001) [mythcat@fedora ~]$ conda list
If you want to see all environments then use the next command:
(test001) [mythcat@fedora ~]$ conda env list
# conda environments:
#
test001 * /home/mythcat/.conda/envs/test001
base /usr
The basic usage of conda is to install packages, you can see how to install the scipy package with the next command:
(test001) [mythcat@fedora ~]$ conda install scipy
Using the conda tool.
Also, you can update a package like the pip tool, see the next command:
(test001) [mythcat@fedora ~]$ conda update
CondaValueError: no package names supplied
# Example: conda update -n myenv scipy
You can deactivate/deactivate the environment with these commands:
(test001) [mythcat@fedora ~]$ conda deactivate
[mythcat@fedora ~]$ conda activate test001
(test001) [mythcat@fedora ~]$
You can export the conda environment into YML file type:
(test001) [mythcat@fedora ~]$ conda env export > test001.yml
(test001) [mythcat@fedora ~]$ ls test001.yml
test001.yml
With this file, you can create a new environment in another area, and see the next commands for deactivating and creating the new environment.
(test001) [mythcat@fedora ~]$ conda deactivate
[mythcat@fedora ~]$ ls
Desktop Downloads Music Public test001.yml
Documents kernel-tests Pictures Templates Videos
[mythcat@fedora ~]$ conda env create -f test001.yml
CondaValueError: prefix already exists: /home/mythcat/.conda/envs/test001
Because I try to create in the same place as the old environment I got this error.
You need to use the YML file in another place.
Another option is to clone one environment.
[mythcat@fedora ~]$ conda create --name test001_new_clone --clone test001
Source: /home/mythcat/.conda/envs/test001
Destination: /home/mythcat/.conda/envs/test001_new_clone
Packages: 34
...
You can see all environments with this command:
[mythcat@fedora ~]$ conda info --env
# conda environments:
#
test001 /home/mythcat/.conda/envs/test001
test001_new_clone /home/mythcat/.conda/envs/test001_new_clone
base * /usr
These commands shown are just the beginning of working with the conda utility. It has many more development options.
Posted by
Cătălin George Feștilă
Labels:
2022,
conda,
dnf,
Fedora,
Fedora 37,
linux,
linux tools,
tutorial,
tutorials
Wednesday, August 24, 2022
Fedora 37 : Kernel Test Days.
The main goal of a Kernel Test Day is to test a new kernel on many different machines as possible ...
To test the kernel and help the Fedora development team you need to run one tool from Fedora.
I used DNF to install the fedora python package.
[root@fedora kernel-tests]# dnf install python3-fedora.noarch
...
Installed:
python3-fedora-1.1.1-7.fc37.noarch
python3-kitchen-1.2.6-14.fc37.noarch
python3-lockfile-1:0.12.2-8.fc37.noarch
python3-munch-2.5.0-10.fc37.noarch
python3-openidc-client-0.6.0-17.20220119git0e2ed81.fc37.noarch
Complete!
I install the Development Tools group for development issues.
[mythcat@fedora kernel-tests]$ sudo dnf -y groupinstall "Development Tools"
I clone the kernel-tests tool from the GitHub repository.
[mythcat@fedora ~]$ git clone https://pagure.io/kernel-tests.git
Cloning into 'kernel-tests'...
Into the folder kernel-tests set your user and password to send data to the Fedora development team.
[mythcat@fedora ~]$ cd kernel-tests/
[mythcat@fedora kernel-tests]$ cp config.example .config
[mythcat@fedora kernel-tests]$ vi .config
Set the SELinux settings, if this is enabled.
[mythcat@fedora kernel-tests]$ sudo semanage boolean -m --on selinuxuser_execheap
I run both tests, like in the documentation area.
See these results of my tests on HP Compaq 6710b laptop:
[mythcat@fedora kernel-tests]$ sudo ./runtests.sh
[sudo] password for mythcat:
Test suite called with default
./default/cachedrop PASS
./default/insert_leap_second PASS
./default/libhugetlbfs SKIP
./default/memfd PASS
./default/modsign PASS
./default/mq-memory-corruption PASS
./default/paxtest SKIP
./default/posix_timers PASS
./default/selinux-dac-controls PASS
./default/stack-randomness PASS
./default/sysfs-perms WARN
./default/timer-overhead PASS
Test suite complete WARN
Your log file is being submitted...
Upload successful!
The following information is not submitted with your log;
it is for informational purposes only.
Vulnerability status:
/sys/devices/system/cpu/vulnerabilities/itlb_multihit:KVM: Mitigation: VMX unsupported
/sys/devices/system/cpu/vulnerabilities/l1tf:Mitigation: PTE Inversion
/sys/devices/system/cpu/vulnerabilities/mds:Vulnerable: Clear CPU buffers attempted, no microcode; SMT disabled
/sys/devices/system/cpu/vulnerabilities/meltdown:Mitigation: PTI
/sys/devices/system/cpu/vulnerabilities/mmio_stale_data:Not affected
/sys/devices/system/cpu/vulnerabilities/retbleed:Not affected
/sys/devices/system/cpu/vulnerabilities/spec_store_bypass:Vulnerable
/sys/devices/system/cpu/vulnerabilities/spectre_v1:Mitigation: usercopy/swapgs barriers and __user pointer sanitization
/sys/devices/system/cpu/vulnerabilities/spectre_v2:Mitigation: Retpolines, STIBP: disabled, RSB filling, PBRSB-eIBRS: Not affected
/sys/devices/system/cpu/vulnerabilities/srbds:Not affected
/sys/devices/system/cpu/vulnerabilities/tsx_async_abort:Not affected
[mythcat@fedora kernel-tests]$ sudo ./runtests.sh -t performance
Test suite called with performance
Using config in CONFIG.fedora
Sun Aug 21 05:19:23 PM EEST 2022
Latency measurements
Sun Aug 21 05:21:46 PM EEST 2022
Calculating file system latency
Sun Aug 21 05:21:48 PM EEST 2022
Local networking
Sun Aug 21 05:25:29 PM EEST 2022
Bandwidth measurements
Sun Aug 21 05:34:57 PM EEST 2022
Calculating context switch overhead
Sun Aug 21 05:35:20 PM EEST 2022
./performance/lmbench3 PASS
Test suite complete PASS
Your log file is being submitted...
Upload successful!
The following information is not submitted with your log;
it is for informational purposes only.
Vulnerability status:
/sys/devices/system/cpu/vulnerabilities/itlb_multihit:KVM: Mitigation: VMX unsupported
/sys/devices/system/cpu/vulnerabilities/l1tf:Mitigation: PTE Inversion
/sys/devices/system/cpu/vulnerabilities/mds:Vulnerable: Clear CPU buffers attempted, no microcode; SMT disabled
/sys/devices/system/cpu/vulnerabilities/meltdown:Mitigation: PTI
/sys/devices/system/cpu/vulnerabilities/mmio_stale_data:Not affected
/sys/devices/system/cpu/vulnerabilities/retbleed:Not affected
/sys/devices/system/cpu/vulnerabilities/spec_store_bypass:Vulnerable
/sys/devices/system/cpu/vulnerabilities/spectre_v1:Mitigation: usercopy/swapgs barriers and __user pointer sanitization
/sys/devices/system/cpu/vulnerabilities/spectre_v2:Mitigation: Retpolines, STIBP: disabled, RSB filling, PBRSB-eIBRS: Not affected
/sys/devices/system/cpu/vulnerabilities/srbds:Not affected
/sys/devices/system/cpu/vulnerabilities/tsx_async_abort:Not affected
Posted by
Cătălin George Feștilă
Labels:
2022,
dnf,
Fedora,
Fedora 37,
git,
GitHub,
kernel-tests,
linux,
linux tools,
tutorial,
tutorials
Subscribe to:
Posts (Atom)