Shell script to help with locking linux session, similar to Cold Turkey. Validated in Pop!_OS 22.04

lock_screen.sh

#!/usr/bin/bash

# Figure out the current file name and path
# https://stackoverflow.com/a/4774063
script_path="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
script_filename=${0##*/}
script_full_path=$script_path/$script_filename


# Shows the help page for this script
show_help() {
  cat << EOF
USAGE: $script_filename [logs] [tail] [help]


Running with no arguments will lock all active sessions.

    --user <username> Lock user's active sessions

    logs    Searches /var/log/syslog for mention of this script
    tail    Tails /var/log/syslog, searching for mention of this script
    help    Display this help and exit

    
Register this script as a cron job by running 
sudo crontab -u $USER -e 
and inserting the following records:
*/5 0-5 * * 1-5 /bin/bash -c "$script_full_path --user $USER"
*/5 2-5 * * 6,0 /bin/bash -c "$script_full_path --user $USER"
EOF
}

# Tails the syslog for mention of this script, hopefully CRON mentions it
logs_tail() {
  tail -f /var/log/syslog | grep "$script_full_path"
}

# Searches the syslog for mention of this script, hopefully CRON mentions it
logs_cat() {
  echo Searching /var/log/syslog for $script_full_path...
  grep "$script_full_path" /var/log/syslog
}

# Uses loginctl to search for sessions belonging to active user
# then, for each, locks them
run_main() {
  if [ $1 == "" ]
  then
    loginctl lock-sessions
  else 
    USER=$1
    echo Looking for active sessions for user $USER...

    for session in $(loginctl show-user $USER -p Sessions --value); do
      session_user=$(loginctl show-session $session --value -p Name)
      session_type=$(loginctl show-session $session --value -p Type)
    
      echo ...found $session_type session with ID=$session belonging to $session_user. Locking...
    
      loginctl lock-session $session
    done
  fi
}


# Parse CLI options
while :; do
  case $1 in
    help|-h|--help|-\?)
      show_help
      exit
      ;;
    logs)
      logs_cat
      exit
      ;;
    tail)
      logs_tail
      exit
      ;;
    --user)
      if [ "$2" == "" ]
      then
      	printf 'WARN: No argument provided for option: --user.  Run `%s help` to view  flags\n' "$script_filename" >&2
      else
        run_main $2
      fi
      exit
      ;;
    -?*)
      printf 'WARN: Unknown option: %s.  Run `%s help` to view flags.\n' "$1" "$script_filename" >&2
      exit
      ;;
    *)
      if [ "$1" == "" ]
      then
        run_main
        exit
      else
        printf 'WARN: Unknown argument: "%s".  Run `%s help` to view flags.\n' "$1" "$script_filename" >&2
        exit
      fi
      ;;
  esac
  
  shift
done