kill all old listed processes

process_watchdog.sh

#! /bin/bash
#
# kill all old processes listed in GUARDLIST_PROCESS owned by users listed in GUARDLIST_USER
#
# Usage:
#  ./process_watchdog GUARDLIST_USER GUARDLIST_PROCESS WHITELIST_USER WHITELIST_PROCESS
#
# - white list are of highest priority
# - processes owned by users listed in WHITELIST_USER will not be killed
# - process listed in WHITELIST_PROCESS will not be killed
#
# user list example:
# ```text
# user1 comment_of_user1
# user2 comment_of_user2
# ...
# userN comment_of_userN
# ```
#
# process list example:
# ```text
# python
# MATLAB
# ```

GUARDLIST_USER=$1
GUARDLIST_PROCESS=$2
WHITELIST_USER=$3
WHITELIST_PROCESS=$3

KILL_TIME=4w

while read userinfo; do
    username=$(echo $userinfo | cut -d' ' -f1)
    if [[ -z "$(grep $username $WHITELIST_USER)" && ! -z "$(grep ^$username /etc/passwd)" ]]; then
        while read tokill_process; do
            if [ -z "$(grep ^$tokill_process $WHITELIST_PROCESS)" ]; then
                killall --quiet --ignore-case -older-than $KILL_TIME -u $username $tokill_process
            fi
        done < $GUARDLIST_PROCESS
    fi
done < $GUARDLIST_USER