#!/bin/sh

CMT="GNU Mailman Account" 

chkmailman() {
    echo "ADD=1" > /tmp/chk$$
    awk ' BEGIN { FS=":" } { print $1 } ' $1 | while read f
    do
        [ "$f" = "mailman" ] && echo "ADD=" > /tmp/chk$$
    done
}

addgrpmailman() {
    groupadd mailman
}

addusrmailman() {
    useradd -g mailman -d /usr/local/mailman -s /bin/sh -c "$CMT" mailman
    echo "Setting the password for the newly created 'mailman' user account."
    passwd mailman
}

chkmailman /etc/group
. /tmp/chk$$
[ "$ADD" ] && addgrpmailman
chkmailman /etc/passwd
. /tmp/chk$$
[ "$ADD" ] && {
    addusrmailman
}
rm -f /tmp/chk$$