Kill all users who are using more than a fixed limit of process on Linux

gistfile1.txt

MAX_PROCESS_LIMIT=10
systemctl status user.slice | 
  egrep "user-[0-9]+\.slice" | 
  sed 's/.*user-\([0-9]*\).*/\1/' |  # get uid
  while read uid; do 
    test $uid -ne 0 && ( # ignore root
      tasks=$( 
        systemctl status user-${uid}.slice | 
        grep -e Tasks 2>&1 | 
        sed 's/\w*Tasks: \([1-9][0-9]*\) (limit: [0-9]*)/\1/' 
       ); 
       test $tasks -gt ${MAX_PROCESS_LIMIT} && pkill -9 -U ${uid}
    ); 
  done