echo $?kody od 0 do 255ls -l      exit code 0 - successecho ;;    exit code 2 - misuse of shell builtins$/usr/bin     exit code 127 - “command not found”foo       exit code 127 - “command not found”read (następnie wciśnięte klawisze ctrl+c)  exit code 130 - script terminated by Control-Clet "zmienna=40/0"    exit code 1 - catchall for general errors