Hi,
I am having files like control and big in /home/sam dir., These files are generated daily with timestamp. If both files cross more than 30 days, the latest one month files should be retained. can i use find with mtime for this?.

Thaj:

You still haven't provided sufficient information. File names for example to create your pair set for comparision. An example would be:

051204.in 051204.out

One could then test for age on each file and create logic that says if 051204.in AND 051204.out are greater than 30 days old THEN keep the older file.

Post a little more detail.

my understanding is that you wish to remove files that are more than 30 days.

you can try this is that is the case:
find /home/sam -mtime +30 -exec rm -f {} \;

Food for ThoughT?

Great feedback! This is what I was looking for also. It's important that when you write a script to do this that you don't just delete them. Figure out who created them, talk to them, also review the list and then when you are sure delete the files.