Universal Linux Tips and Tricks

linux.txt

# Linux tips & tricks
#####################

- Binding WIN+L or Ctl+Alt+L to xscreensaver-lock:
==================================================
  1. edit ~/.config/openbox/ubuntu-rc.xml
  2. <keybind key="C-A-L">
        <action name="Execute">
          <command>dm-tool lock</command>
        </action>
      </keybind>
      <keybind key="W-L">
        <action name="Execute">
          <command>dm-tool lock</command>
        </action>
      </keybind>
  3. openbox --reconfigure

- Get colored output on jq with less:
=====================================
  jq -C '' random.json | less -R
	
- Rotating second monitor display:
==================================
  xrandr --screen DP2 --rotate left
	
- Change keyboard locale:
=========================
  sudo dpkg-reconfigure keyboard-configuration
  setxkbmap hu

- Get command autocompletion in the prompt:
===========================================
  sudo apt-get install bash-completion
  
- Sorting and displaying count of unique hits from a list:
==========================================================
  cat list.txt | sort | uniq -c | sort -rn | less
  
- Grep switches and colored output with less:
==========================================================
  grep -ahioRE --color=always | less --RAW-CONTROL-CHARS
  
- For loop with bash:
==========================================================  
  for i in $(seq -q 01 31); do echo -n "$i"; cat $i-day.csv | egrep -aiRE 'C\:' | awk -F, '{print $12}' > $i-day.txt; done

- Cutting filenames from full paths:
==========================================================
  sed 's/\\[^\\]\+$//' paths.txt
  
- Sorting output into columns:
==========================================================
  paste - - -
  xargs -n5 -d'\n'

- jq-fu:
==========================================================
  jq -rC '.data[].file[] | select(.family == "malware")? | .category?,.type[].code?' list.json | less -R