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@bahamat
bahamat / shell_config.md
Last active March 15, 2023 02:42
How are various shells configured, and in which order?

ash & dash

login interactive files
N N
N Y $ENV
Y N /etc/profile, ~/.profile
Y Y /etc/profile, ~/.profile, $ENV

bash

@tayvano
tayvano / gist:6e2d456a9897f55025e25035478a3a50
Created February 19, 2017 05:29
complete list of ffmpeg flags / commands
Originall From: Posted 2015-05-29 http://ubwg.net/b/full-list-of-ffmpeg-flags-and-options
This is the complete list that’s outputted by ffmpeg when running ffmpeg -h full.
usage: ffmpeg [options] [[infile options] -i infile]… {[outfile options] outfile}…
Getting help:
-h — print basic options
-h long — print more options
-h full — print all options (including all format and codec specific options, very long)
@houtianze
houtianze / sysv.init.script.to.systemd.unit.file.md
Last active April 3, 2025 17:44
Convert SysV Init scripts to Systemd Unit File

Let's say you have a SysV Init Script named foo

  1. Copy the file to /etc/init.d/foo

  2. Enable the SysV service: chkconfig --add foo

  3. Enable the SysV service: chkconfig foo on

  4. Start the service: service foo start. After this, systemd-sysv-generator will generate this file /run/systemd/generator.late/foo.service, copy this file to /etc/systemd/system by running: cp /run/systemd/generator.late/foo.service /etc/systemd/system/foo.service

  5. Edit /etc/systemd/system/foo.service by running systemctl edit foo.service, add in the following line to foo.servie (this makes the service installable)

[Install]

@dmsimard
dmsimard / human_log.py
Last active December 8, 2021 13:51 — forked from cliffano/human_log.py
Ansible callback plugin for human-readable result logging - http://blog.cliffano.com/2014/04/06/human-readable-ansible-playbook-log-output-using-callback-plugin/
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
@alexjj
alexjj / ZFS Snapshot Deletion
Created April 15, 2015 17:09
Delete all ZFS Snapshots
zfs list -H -o name -t snapshot | xargs -n1 zfs destroy
@myusuf3
myusuf3 / delete_git_submodule.md
Created November 3, 2014 17:36
How effectively delete a git submodule.

To remove a submodule you need to:

  • Delete the relevant section from the .gitmodules file.
  • Stage the .gitmodules changes git add .gitmodules
  • Delete the relevant section from .git/config.
  • Run git rm --cached path_to_submodule (no trailing slash).
  • Run rm -rf .git/modules/path_to_submodule (no trailing slash).
  • Commit git commit -m "Removed submodule "
  • Delete the now untracked submodule files rm -rf path_to_submodule
@cliffano
cliffano / human_log.py
Last active February 1, 2025 00:47
Ansible callback plugin for human-readable result logging - http://blog.cliffano.com/2014/04/06/human-readable-ansible-playbook-log-output-using-callback-plugin/
# This gist is compatible with Ansible 1.x .
# For Ansible 2.x , please check out:
# - https://gist.github.com/dmsimard/cd706de198c85a8255f6
# - https://github.com/n0ts/ansible-human_log
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#