GNU Coreutils/other useful UNIXy stuff

There are a lot of useful things in the GNU coreutils that are useful but many people (me) had no idea that they even exist... here are a few:

• sort sort the contents of a file
• -r reverse
• -f ignore case
• -n numeric
• -b ignore leading blanks
• -c check if sorted (no printout = sorted)
• uniq remove duplicate lines from a sorted file
• -c sort and count number of occurances
• -i ignore case

Of course, if you ever want any information about the coreutils: info coreutils