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→KEY CONCEPTS
*can specify a '''range of line numbers'''
*can specify a '''regular expression''' to select all lines that match
*'''Note:''' when using regular expressions, you must delimit them with a <br>'''forward-slash''' "'''/'''"<br>default address (if none is specified) will match every line
[[Image:sed.png|thumb|right|500px|'''Common instructions''' to take action if text matches an address.]]
