Shell Programming and Scripting

Also, do you want to check the last modified time or creation time of the file?
Getting the creation time of the file may not be straight forward. Is your filesystem ext4?

--ahamed

The following seems to do what you want as long as:

Code:

#!/bin/ksh
date "+%b %e" | (read m d
        ls -l | awk -v m=$m -v d=$d '
                $6 != m || $7 != d || c[substr($8,1,2)]++ < 20 { next }
                {printf("rm %s\n", $9)}' |
        ksh -v
)

If you don't want to see the list of files being removed, change the line:

Code:

        ksh -v

to:

Code:

        ksh

I tested this using ksh on Mac OS X, but if you change both occurrences of ksh in this script to the name of any other shell that accepts basic Bourne shell syntax, it should still work. If you are going to run this on a Solaris system, use /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk instead of awk.

I strongly suggest that you replace the rm in red in the script above with echo until you have verified that it does what you want it to do.