Shell Programming and Scripting

#!/bin/bash
# shutdownmenu.sh - A shell script for a shutdown menu

# Store menu options selected
INPUT=/tmp/menu.sh.$$

# Clear screen then display menu box
dialog --clear \
--title "[ Shutdown Options ]" \
--menu "Use the UP/DOWN arrow keys, the first letter of the choice, \
or the number keys 1-3 to choose an option." 12 50 3 \
Shutdown_computer "" \
Restart_computer "" \
Terminal_mode "" \
2>"${INPUT}"
 
menuitem=$(<"${INPUT}")
  
# make decsion 
case $menuitem in

# delete temp file then shutdown
  Shutdown_computer) [ -f $INPUT ] && rm $INPUT; poweroff;;

# delete temp file then reboot
  Restart_computer) [ -f $INPUT ] && rm $INPUT; reboot;;

# delete temp file then exit to terminal
  Terminal_mode) [ -f $INPUT ] && rm $INPUT; clear;;

# catchall for cancel or other input
# delete temp file then exit to terminal
  *) [ -f $INPUT ] && rm $INPUT; clear;;
esac