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Thursday, January 6, 2011

Menu Driven Shell Script - Using Dialog Utility



#!/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 #################################

# Shows today's date and time

show_time()
{
dialog --backtitle "MENU DRIVEN PROGRAM" --title "DATE & TIME" \
--msgbox "\n Today's Date: `date +"%d-%m-%Y"` \n\n \
Today's Time: `date +"%r %Z"`" 10 60
}

####################### show_cal function ###################################

# Shows current month calendar

show_cal()
{
dialog --backtitle "MENU DRIVEN PROGRAM" --title "CALENDAR" \
--msgbox "`cal`" 12 25
}

####################### deletefile function #################################

# Used to delete file under supplied directory, not including sub dirs.

deletefile()
{

dialog --backtitle "MENU DRIVEN PROGRAM" --title "Directory Path" \
--inputbox "\nEnter directory path (Absolute or Relative) \
\nPress just Enter for current directory" 12 60 2> temp1.$$

if [ $? -ne 0 ]
then
rm -f temp1.$$
return
fi

rmdir=`cat temp1.$$`

if [ -z "$rmdir" ]
then
dirname=$(pwd) # You can also use `pwd`
rmdir=$dirname/*
else

# remove trailing * and / from directory path

echo "$rmdir" | grep "\*$" &> /dev/null && rmdir=${rmdir%\*}
echo "$rmdir" | grep "/$" &> /dev/null && rmdir=${rmdir%/}

# Check supplied directory exist or not

( 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

else
dialog --backtitle "MENU DRIVEN PROGRAM" \
--title "Information : DELETION ABORTED" \
--msgbox "Action Aborted: \n\n $file2remove not deleted" 8 70
fi ;;

*) deletetempfiles # Remove temporary files
return ;;
esac

deletetempfiles # remove temporary files
return
}

########################## currentusers function ############################

currentusers()
{
who > userslist.$$
dialog --backtitle "MENU DRIVEN PROGRAM" \
--title "CURRENTLY LOGGED IN USERS LIST" \
--textbox userslist.$$ 12 60
}

############################ diskstats function #############################

diskstats()
{
df -h | grep "^/" > statsfile.$$
dialog --backtitle "MENU DRIVEN PROGRAM" \
--title "DISK STATISTICS" \
--textbox statsfile.$$ 10 60
}

##############################################################################
# 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.$$

retopt=$?
choice=`cat menuchoices.$$`

case $retopt in

0) case $choice in

DATE_TIME) show_time ;;
CALENDAR) show_cal ;;
DELETE) deletefile ;;
USERS) currentusers ;;
DISK) diskstats ;;
EXIT) clear; exit 0;;

esac ;;

*)clear ; exit ;;
esac

done

OUTPUT:
[venu@localhost ~]$ sh menu_dialog.sh

SAMPLE SCREEN SHOTS:

Main Menu:
Users:

Disk Stats:

Delete File:



6 comments:

  1. Its very nice,I will try this.

    ReplyDelete
  2. can u pls let me know as how do i create multiple input boxes in single screen.

    For ex:

    Enter your name:
    Enter your age:
    Enter your nation:

    pls mail me to mannodaada@gmail.com. It will be a great help

    ReplyDelete
  3. the menu lists out in one option in each line..
    thats ok..
    but how can i print - 1 "Insert" 2 "Delete" 3 "Exit"
    all options of menu in one single line in dialog menu ??

    ReplyDelete
  4. how much arguments can we pass to input dialog box and what are they mean for????

    ReplyDelete
  5. Can you tell me how to call this script from command prompt passing all these arguments in one shot? so the uses will not be prompted all the time

    ReplyDelete
  6. nice sript

    is it possible to write a menu driven bash script to display all user accounts, create new user accounts and delete an user account???

    if yes could you please help me

    ReplyDelete