See AWK also, which is often a companion to SED.

HANDY ONE-LINERS FOR SED (Unix stream editor) Apr. 26, 2004 compiled by Eric Pement - pemente[at]northpark[dot]edu version 5.4

Latest version of this file is usually at: http://sed.sourceforge.net/sed1line.txt

TYPICAL USE: Sed takes one or more editing commands and applies all of them, in sequence, to each line of input. After all the commands have been applied to the first input line, that line is output and a second input line is taken for processing, and the cycle repeats. The preceding examples assume that input comes from the standard input device (i.e, the console, normally this will be piped input). One or more filenames can be appended to the command line if the input does not come from stdin. Output is sent to stdout (the screen). Thus:

 cat filename | sed '10q'        # uses piped input
 sed '10q' filename              # same effect, avoids a useless "cat"
 sed '10q' filename > newfile    # redirects output to disk

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