• $0 = nabe of the script
  • $# = number of command line arguments of the script
  • $1, $2, … = arguments of the script
  • $*, $@ = all arguments from command line
  • “$*” = all arguments as one string -> “$1 $2 …”
  • “$@” = all arguments with quotes -> “$1” “$2” …
  • $? = exit value of last command
  • $- = options used by script
  • $$ = process number of the shell
  • $! = process number of last background command