Complete Command in Editor : Ctrl + X + E
Set Default Editor : $EDITOR
Open a file in its default application : xdg-open
Redirect Errors to Output File : ls -lah file.txt not-here > output.txt 2>&1
Read input from user till EOF not reached : cat << EOF > <filename>
The -- operator is used as argument separator
cd -- -foo : Change directory to -foo folder (Without the argument separator -foo would have been interpreted as -f -o -o)
Fork Bomb
:(){ :|: & };:INFO
- Configure Limits:
/etc/security/limits.conf- This restriction does not work on the root user
Flatpak Dark Theme
The following package has to be installed: gnome-themes-extra
# List all GTK3 Themes
flatpak search org.gtk.Gtk3theme
# Install Theme
flatpak install org.gtk.Gtk3theme.Adwaita-darkQuick Fixes for Flatpak Dark Mode Detection Issues
App Launch Scripts
System-wide: /usr/share/applications
User-specific: ~/.local/share/applications
User-specific launch scripts take precedence over system-wide scripts
The system-wide scripts can be get reset on application update
Application icons can be changed by editing the .desktop files
File Globing
ls project? # Single Character
ls *.sh # One or more character
touch foo{,2,5,10} # Expanded Form : touch foo foo2 foo5 foo10
# Cartesian Product Outputs
touch project{1,2}/src/test/test{1,2,3}.py
touch {foo,bar}/{a..j}
# Expand for all digits
ls /sys/bus/cpu/devices/cpu[0-9]*Line Ending Conversion
Convert \r\n to \n
sed -i 's/\r$//' inputfile
sed 's/\r$//' inputfile > outputfile
tr -d '\r' < inputfile > outputfileConvert \n to \r\n
sed -i 's/$/\r/' inputfile
sed 's/$/\r/' inputfile > outputfile
tr '\n' '\r\n' < inputfile > outputfile