POSTS

Linux Tips

This page may be updated with more tips in the future. It's mostly a skeleton for now.

Audio/Sound

Where does WirePlumber store application-specific volume levels?

They're in ~/.local/state/wireplumber/restore-stream.

Text

Common (GUI) text editor shortcuts

  • Left/Right: Previous/next character
  • Ctrl+Left/Right: Previous/next word
  • Up/Down: Previous/next line
  • Home/End: Start/end of current line
  • Ctrl+Home/End: Start/end of the whole text
  • Shift+(any key that moves the cursor): Select text between the current and new cursor positions

Network

netstat/ss -ntuap to show all TCP and UDP connections with process names. ss -ntuapl to show listening connections only.

DNS

You can change your system's DNS server by editing resolvconf.conf and running resolvconf -u, but editing resolv.conf directly and removing resolvconf(the software that is called "resolvconf", not the resolv.conf file. Confusing.) is much easier.

Shell

In Bash, ${<variable name>%.*} strips the extension from filenames. For example:

for i in *.png *.jpg; do cjxl -d 0 "$i" /dev/shm/"${i%.*}".jxl; done

transcodes all .png and .jpg files in the current directory into jxl and saves them in /dev/shm.

GNU Parallel

Using the parallel command:

parallel cjxl -d 0 "{}" /dev/shm/"{.}".jxl ::: *.png *.jpg

does the same thing. {} is the input filename. {.} is the input filename without the extension.

Recommendations

Utilities

  • Disk IO monitoring: iotop
  • CPU monitoring: htop
  • GPU monitoring: nvtop

OOM

Consider using earlyoom to prevent the whole system becoming unresponsive in OOM situations.

Config example(/etc/default/earlyoom):

EARLYOOM_ARGS="-r 0 -m 2 -s 50 --avoid '(^|/)(init|systemd|Xorg|sshd|plasmashell)$'"