#!/bin/bash # scRIPT : menu_dialog.sh # PURPOSE : A menu driven Shell script using dialog utility # which has following options: # Display Today's Date and Time. # Display calendar. # Delete selected file from supplied directory. # List of users currently logged in # Disk Statistics # Exit # ############################################################################## # Checking availability of dialog utility # ##############################################################################
# dialog is a utility installed by default on all major Linux distributions. # But it is good to check availability of dialog utility on your Linux box.
which dialog &> /dev/null
[ $? -ne 0 ] && echo "Dialog utility is not available, Install it" && exit 1
############################################################################## # Define Functions Here # ##############################################################################
###################### deletetempfiles function ##############################
# This function is called by trap command # For conformation of deletion use rm -fi *.$$
deletetempfiles() { rm -f *.$$ }
######################## Show_time function #################################
( cd $rmdir 2>&1 | grep "No such file or directory" &> /dev/null )
# Above codeblock run in sub shell, so your current directory persists.
if [ $? -eq 0 ] then dialog --backtitle "MENU DRIVEN PROGRAM" \ --title "Validating Directory" \ --msgbox "\n $rmdir: No such file or directory \ \n\n Press ENTER to return to the Main Menu" 10 60 return fi
# Do you have proper permissions ?
( cd $rmdir 2> /dev/null )
if [ $? -ne 0 ] then dialog --backtitle "MENU DRIVEN PROGRAM" \ --title "Checking Permissions" \ --msgbox "\n $rmdir: Permission denied to access this directory \ \n\n Press ENTER to return to the Main Menu" 10 60 return fi
if [ ! -r $rmdir ] then dialog --backtitle "MENU DRIVEN PROGRAM" \ --title "Checking Permissions" \ --msgbox "\n $rmdir: No read permission \ \n\n Press ENTER to return to the Main Menu" 10 60 return fi
dirname=$rmdir rmdir=$rmdir/* # get all the files under given directory
fi
for i in $rmdir # process each file do
# Store all regular file names in temp2.$$
if [ -f $i ] then echo " $i delete? " >> temp2.$$ fi
done
if [ -f temp2.$$ ] then dialog --backtitle "MENU DRIVEN PROGRAM" \ --title "Select File to Delete" \ --menu "Use [UP/DOWN] keys to move, then press enter \ \nFiles under directory $dirname:" 18 60 12 \ `cat temp2.$$` 2> file2delete.$$ else dialog --backtitle "MENU DRIVEN PROGRAM" --title "Select File to Delete" \ --msgbox "\n\n There are no regular files in $dirname directory" 10 60 return fi
rtval=$?
file2remove=`cat file2delete.$$`
case $rtval in
0) dialog --backtitle "MENU DRIVEN PROGRAM" --title "ARE YOU SURE" \ --yesno "\nDo you Want to Delete File: $file2remove" 7 70
if [ $? -eq 0 ] then rm -f $file2remove 2> Errorfile.$$
# Check file successfully deleted or not.
if [ $? -eq 0 ] then dialog --backtitle "MENU DRIVEN PROGRAM" \ --title "Information : FILE DELETED" \ --msgbox "\nFile : $file2remove deleted" 8 70 else dialog --backtitle "MENU DRIVEN PROGRAM" \ --title "Information : ERROR ON DELETION" \ --msgbox "\nProblem in Deleting File: $file2remove \ \n\nError: `cat Errorfile.$$` \n\nPress ENTER to return to the Main Menu" 12 70 fi
############################################################################## # MAIN STRATS HERE # ##############################################################################
trap 'deletetempfiles' EXIT # calls deletetempfiles function on exit
while : do
# Dialog utility to display options list
dialog --clear --backtitle "MENU DRIVEN PROGRAM" --title "MAIN MENU" \ --menu "Use [UP/DOWN] key to move" 12 60 6 \ "DATE_TIME" "TO DISPLAY DATE AND TIME" \ "CALENDAR" "TO DISPLAY CALENDAR" \ "DELETE" "TO DELETE FILES" \ "USERS" "TO LIST CURRENTLY LOGGED IN USERS" \ "DISK" "TO DISPLAY DISK STATISTICS" \ "EXIT" "TO EXIT" 2> menuchoices.$$
