====== Wc ======

= WC - Word Count =

Count lines or words.
 ls | wc -l  <nowiki>//</nowiki>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
 <nowiki>//</nowiki>think of k meaning sort by column number.
 <nowiki>//</nowiki>another method just for ps:
 ps aux –sort:rss
 <nowiki>//</nowiki>explaination for memory usage: http://unix.derkeiler.com/Newsgroups/comp.unix.aix/2007-07/msg00026.html

man wc for other usage.