Shell Programming and Scripting

I have one script by which I am taking Extraction Schedule in the following format [HH:MM],[HH:MM],[HH:MM],......[HH:MM]

Here I want validate the Input from user is okey or not.
Let say i have one variable SCH
SCH=12:34,23:12,11:20

Could you please tell me how I will validate it.
HH & MM Both should be Numeric
HH should not Greater then 24
MM should not greater then 60
Note: Here I am using comma (,) as a delimeter.

Thanks
Sanjay

Could anyone let me know if
SCH=12:34,23:12,11:20... N numbers
How can I print like below
12:34
23:12
11:20

Code:

echo ${SCH} | tr ',' '\n'

Bingo !!!

Thanks Vino Bro !!

Anyone who can help me !!!

I have one script by which I am taking Extraction Schedule in the following format [HH:MM],[HH:MM],[HH:MM],......[HH:MM]

Here I want validate the Input from user is okey or not.
Let say i have one variable SCH
SCH=12:34,23:12,11:20

Could you please tell me how I will validate it.
HH & MM Both should be Numeric
HH should not Greater then 24
MM should not greater then 60
Note: Here I am using comma (,) as a delimeter.

Thanks
Sanjay

Myscript is test.sh is looks like
_________________________________
#!/bin/bash
echo -n "Enter Time schedule in the following format [HH:MM],[HH:MM],..:"
read Ext_Sch
for val in `echo $Ext_Sch |tr ',' '\n'`
do
tmp=""
tmp=`echo $val | grep "^[0-2][0-4]:[0-6][0-9]"`
echo " After getting the Value of tmp is $tmp"
if [ "$tmp" = "" ]
then
echo "Invalid Format !! Re-enter Time schedule in the following format [HH:MM],[HH:MM],..:"
continue
fi
break
done
-------------------
I want give input like 27:40,10:30,17:40

Here this scripts should validate the HH:MM !!!
Please help me out

if you have GNU date, it might be easier to do this method of checking

Code:

# date -d "18:99"
date: invalid date `18:99'
# echo $?
1
# date -d "18:59"
Wed Sep 26 18:59:00 
# echo $?
0