Wc

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WC - Word Count

Count lines or words.

ls | wc -l  //Count the number of files in a directory

List, Print 1st or n'th column, sort, unique, count entries:

last | awk '{ print $1}' | sort | uniq | wc -l

Sorting

Sort by Memory Usage:

ps aux | sort -n -k4
//think of k meaning sort by column number.
//another method just for ps:
ps aux –sort:rss
//explaination for memory usage: http://unix.derkeiler.com/Newsgroups/comp.unix.aix/2007-07/msg00026.html

man wc for other usage.

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