Виктор

#!/bin/bash
PIDFILE=/home/usertest/bot.pid

if pgrep --pidfile $PIDFILE &>/dev/null; then
    echo "Exit! Python bot is already running!"
    exit 1
else
  nohup /usr/bin/python3.6 /home/usertest/bot.py &>/dev/null &
  echo $!>$PIDFILE
fi