This is the individual login shell cleanup file, executed when a login shell exits. This file exists in users home directory i.e. $HOME/.bash_logout. This is useful if you want to run task or another script or command automatically at logout. For example, [clear the mysql command line] history stored in ~/.mysql_history or make backup of files you can use this file.
Sample $HOME/.bash_logout file
clean # clear history /bin/rm $HOME/.mysql_history # Backup files to NAS server ~/bin/backup.sh