Bash

Arrays

create an array in variable FOO

FOO=(foo bar baz)

access element 1 of FOO

${FOO[1]}

give us all elements of FOO

${FOO[@]}

give us the number of elements FOO contains

${#FOO[@]}

Environment Variables

• HISTFILE
  • set path to file, where bash history is stored (default ~/.bash_history)
  • f.e. disable history: HISTFILE=/dev/null
• LC_ALL
  • override all localisation settings
  • f.e. read manpage in system's/application's 'default' language: LC_ALL=C man man
• TMOUT
  • session timeout in seconds
  • f.e. kill the shell after 5 minutes of inactivity: TMOUT=300

misc

use vi-keybindings in bash

set -o vi

uppercase a string variable

${var^^}