Added a bunch.

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proledatarian 2022-02-08 19:01:40 +00:00
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# Random Linux Tips (WIP) # Random Linux Tips (WIP)
*This is a random collection of useful thing I came across by simply using Linux.
It's mostly distro-agnostic and sometimes specific for Arch- and/or pacman-based distros.*
### 0. *Short example template.* ### 0. *Short example template.*
- Description: *What is this good for.* - Description: *What is this good for.*
- Requires: *Do you need any particular software (provide a link)?* - Requires: *Do you need any particular software (provide a link)?*
- How-to: *Straight forward description and maybe a code example.* - How-to: *Straight forward description and maybe a code example.*
- *Detailled description if necessary.* - *Detailled description if necessary.*
- `sudo this is the actual code lol` - `# this is the actual code lol`
- Aditionally: *Anything else that might be important like additional ressources.* - Aditionally: *Anything else that might be important like additional ressources.*
### 1. Automatically clear cache. ### 1. Automatically clear cache.
- Description: Move files older than a specific amount of time from your user's ~/.cache directory to the trash. - Description: Move files older than a specific amount of time from your user's ~/.cache directory to the trash.
- Requires: [rmtrash](https://github.com/PhrozenByte/rmtrash). - Requires: [rmtrash](https://github.com/PhrozenByte/rmtrash).
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### 2. Limit Systemd journal size. ### 2. Limit Systemd journal size.
- Description: Limit the Systemd journal to a specific size. - Description: Limit the Systemd journal to a specific size.
- Requires: Specific to systems using [Systemd](https://systemd.io/). - Requires: Specific to systems using [Systemd](https://systemd.io/).
- How-to: - How-to: Edit `/etc/systemd/journald.conf` and change `SystemMaxUse=50M`.
- Edit `/etc/systemd/journald.conf` and change `SystemMaxUse=50M`.
- Additionally: [ArchWiki: Systemd](https://wiki.archlinux.org/title/Systemd/Journal#Journal_size_limit). - Additionally: [ArchWiki: Systemd](https://wiki.archlinux.org/title/Systemd/Journal#Journal_size_limit).
- Additionally: This can also be achieved using `journalctl` and be [limited by time](https://wiki.archlinux.org/title/Systemd/Journal#Clean_journal_files_manually). - Additionally: This can also be achieved using `journalctl` and be [limited by time](https://wiki.archlinux.org/title/Systemd/Journal#Clean_journal_files_manually).
### 3. Syntax highlight for nano ### 3. Syntax highlight for nano
- Description: Enable syntax highlighting for nano. - Description: Enable syntax highlighting for nano.
- Requires: - Requires: The [nano](https://www.nano-editor.org/) editor.
- How-to: Edit `~/.config/nano/nanorc` or to `/etc/nanorc` and add the following. - How-to: Edit `~/.config/nano/nanorc` or to `/etc/nanorc` and add the following.
- `include "/usr/share/nano/*.nanorc"`. - `include "/usr/share/nano/*.nanorc"`.
- Additionally: [ArchWiki: Nano](https://wiki.archlinux.org/title/Nano#Syntax_highlighting). - Additionally: [ArchWiki: Nano](https://wiki.archlinux.org/title/Nano#Syntax_highlighting).
### 4. Repeat a command using watch. ### 4. Repeat a command using watch.
- Description: Repeat and watch a command in a custom interval.
- Requires: The [procfs](https://gitlab.com/procps-ng/procps) package.
- How-to: Use `watch` followed by your command.
- Example: `# watch -n 1.0 "du -h -s ./$folder`
- This prints the summarized size of $folder in human-readable format every second.
- Additionally: ---
### 5. Use sudo !!. ### 5. Use sudo !!.
- Description: Repeat the last command using sudo.
- Requires: The [sudo](https://www.sudo.ws/) package.
- How-to: Just type `sudo !!` and the last command will be repeated using `sudo`.
- Additionally: ---
### 6. Prevent overwriting files. ### 6. Prevent overwriting files.
- Description: Use alias for *rm*, *cp* and *mv*. - Description: Use alias for *rm*, *cp* and *mv*.
- How-to: Add the following alias into your ~/.bashrc. - How-to: Add the following alias into your ~/.bashrc.
- Use *-interactive* option to get asked before overwriting files. - Use *-interactive* option to get asked before overwriting files.
- `alias mv="mv -i"` - `alias mv="mv -i"`
- Additionally: Further reading in the Arch wiki. - Additionally: [ArchWiki: Core utilities](https://wiki.archlinux.org/title/Core_utilities#Preventing_data_loss).
### 7. Paccache timer ### 7. Auto-clean package cache.
- Requires: A pacman-based distro and the pacman-contrib package. - Description: Automatically clean the pacman package cache using paccache.
- Requires: A [pacman-based distro](https://en.wikipedia.org/wiki/List_of_Linux_distributions#Pacman-based) and the [pacman-contrib](https://github.com/archlinux/pacman-contrib) package.
- How-to: Enable the paccache.timer.
- # systemctl enable paccache.timer
- Additionally: Edit the paccache.service in /usr/lib/systemd/system/ and change the command to e.g. keep the latest installed version and no uninstalled version of all packages: `ExecStart=/usr/bin/paccache -rk1 && /usr/bin/paccache -ruk0`
### 8. Passwordless SSH ### 8. Passwordless SSH
- Description: Connect to a device using SSH without a password.
### 9. Automatically clean orphaned packages. - Requires:
`0 20 * * * /usr/bin/pacman -Qtdq | /usr/bin/pacman -Rns -` - How-to:
-
- Additionally:
### 9. Automatically clean orphaned packages.
- Description: Automatically remove orphaned packages.
- Requires: A pacman-based distribution.
- How-to: Add the following line to your crontab.
- `0 20 * * * /usr/bin/pacman -Qtdq | /usr/bin/pacman -Rns -`
- Additionally: This example removes orphans everyday at 8 p. m. but the
### 10. Automatic retrieve latest mirrors.
- Description: Automatically retrieve the latest Arch Linux mirrors and write them to the mirrorlist.
- Requires: An Arch-based distro and [reflector](https://xyne.dev/projects/reflector/).
- How-to: Install reflector and enable the reflector.timer.
- `# systemctl enable reflector.timer`
- Additionally: [ArchWiki](https://wiki.archlinux.org/title/Reflector#systemd_timer).