Automatically re-start script as root

If you use sudo you can automatically re-start scripts that need to be run as root by adding a check at the beginning of the script and executing sudo if the script is not running as root:

  if [[ $UID -ne 0 ]]; then
    sudo -p 'Restarting as root, password: ' bash $0 "$@"
    exit $?

The inclusion of "bash" in the sudo command is to avoid problems if the script does not have its execute bit set. The "exit $?" causes the shell to exit with the status from the script instance that sudo runs.

Mitch Frazier is an embedded systems programmer at Emerson Electric Co. Mitch has been a contributor to and a friend of Linux Journal since the early 2000s.

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