#!/bin/bash

#using select in the menu

temp=$(mktemp -t test.XXXXXX)

temp2=$(mktemp -t test2.XXXXXX)

function diskspace {

    df -k > $temp

    dialog --textbox $temp 20 60

}

function whoseon {

    who > $temp

    dialog --textbox $temp 20 60

}

function menusage {

    cat /proc/meminfo > $temp

    dialog --textbox $temp 20 60

}

while [ 1 ]

do

dialog --menu "Sys Admin Menu" 20 30 10 1 "Display disk space" 2 "Display logged on users" 3 "Display memory usage" 0 "Exit" 2>$temp2

if [ $? eq 1 ]

then

   break

fi

selection=$(cat $temp2)

case $selection in

  0)

     break;;

  1)

     diskspace;;

  2)

    whoseon;;

  3)

    menusage ;;

  *)

   dialog --msgbox "Sorry,invalid  selection" 10 30

  esac

done

rm -rf $temp 2> /dev/null

rm -rf $temp2 2> /dev/null