Shell Programming and Scripting

Ghost Thanks for your quick response !!
Now I am using that date with in my script
-------------
echo -n "Enter Time schedule in the following format [HH:MM],[HH:MM],..:"
read Ext_Sch
date -d $Ext_Sch
count=`echo $?`
if [ $count -eq 0 ]
then
echo Valid
else
echo Wrong
fi
------------
[Sanjaytmp]$ sh tt.sh
Enter Time schedule in the following format [HH:MM],[HH:MM],..:28:33
date: invalid date `28:33'
Wrong
---------------------
[Sanjaytmp]$Enter Time schedule in the following format [HH:MM],[HH:MM],..:23:45
Thu Sep 27 23:45:00 IST 2007
Valid


Here I am getting the message in my output(show in bold letter) as well that I dun want.
Could you help me how I will ignore it.

Thanks
Sanjay

Perhaps something like this.

Code:

[/tmp]$ cat try.ksh
#! /bin/ksh

str=a:23,23:12,11:20,25:67

echo $str | tr ',' '\n' | while IFS=: read hour min
do
    if [[ $hour = *[:alpha:]* ]] ; then
        echo "$hour:$min is invalid"
    elif [[ $hour -lt 0 || $hour -gt 23 || $min -lt 0 || $min -gt 60 ]] ; then
        echo "$hour:$min is wrong"
    else
        echo $hour:$min
    fi;
done
[/tmp]$ ./try.ksh
a:23 is invalid
23:12
11:20
25:67 is wrong
[/tmp]$

Code:

# date -d "18:99" > /dev/null 2>&1
# echo $?
1

Bingo !!!!

Ghost It wokring for me perfect ...
Thanks a lot !!

~~~Sanjay~~~