linuxshsudo

Adding users to sudoers through shell script

Is it possible to add users to the sudoers file through a shell script? I've been looking around, still can't find anything.

Solution

  • You could simply echo (with elevated privileges, of course) directly to the /etc/sudoers file:

    sudo -i
echo 'nickw444  ALL=(ALL:ALL) ALL' >> /etc/sudoers
#             ^^
#             tab

    (note the tab character between the username and the first ALL)

    Or, for a script:

    #!/bin/bash
# Run me with superuser privileges
echo 'nickw444  ALL=(ALL:ALL) ALL' >> /etc/sudoers

    Then save to somefile.sh, chmod a+rx it, and run sudo ./somefile.sh from a terminal window.

    To add multiple users, change the script to this;

    #!/bin/bash

while [[ -n $1 ]]; do
    echo "$1    ALL=(ALL:ALL) ALL" >> /etc/sudoers;
    shift # shift all parameters;
done

    Then, run the script like this (assuming you saved it as addsudousers.sh):

    sudo ./addsudousers.sh bob joe jeff

    that is, space-separated.

    To read the names from a file:

    nickw444@laptop ~ $ sudo ./addsudousers.sh `cat listofusers.txt`

    listofusers.txt should also be space-separated.

    Edit: Jappie Kirk rightly points out that you can't directly call sudo echo ... >> /etc/sudoers because the >> redirection is handled by the shell, which has by that point dropped the superuser privileges. However, if you run a script that contains echo ... >> /etc/sudoers and the script itself has superuser privileges, everything should work just fine.