check for user running a program before updating and skip them if they are

ck_userupdate.sh

#!/bin/bash
#
#  Proof of concept
#  check for user running a program before updating and skip them if they are
#  

PROGRAM="irssi"

# Check ps for users running a process name & compare against list of non-admin users
#
upgradable_users=`comm -13 <(ps -C $PROGRAM -o fuser |grep -v USER|sort|uniq) <(awk -F: '$3 > 500 {print $1}' /etc/passwd|sort)`

for cur_user in $upgradable_users
do
        #echo "fixing $cur_user 's problems with $PROGRAM"
        ls -ld /home/"$cur_user" 
done