#!/bin/bash
#
#sudosu.sh "user" -c "cmd"

if [ $# -lt 3 ]; then
    echo 'Not enough arguments: sudosu.sh "user" -c "cmd"' >&2
    exit 1
fi

if [ x"-c" != x"$2" ]; then
    echo 'Wrong 2nd arg: sudosu.sh "user" -c "cmd"' >&2
    exit 1
fi

printf '%s\n' "$3" | sudo su - "$1"