These are some utilties that I wrote years ago which I still find helpful.
- bigfiles.pl - lists files by size in cwd and down
- bigdirs.pl - list directories by number of entries in cwd and down
- newmodlist.pl - lists files by date modified in cwd and down
- average-time.pl - given a list of times in mm:ss format, print the total and average
- TelnetEmail.pm - send quick SMTP messages with a minimum of overhead