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→Using the sed Utility
'''Address:'''
*can use a '''line number''', to select a specific line (for example: 5) *can specify a '''range of line numbers (for example: 5,7) ''' *can specify a '''regular expression ''' to select all lines that match (e.g *'''/^happy[0-9]/Note:''') *Note: when using regular expressions, you must delimit them with a forward-slash"/"<br>default address (if none is specified) will match every line
[[Image:sed.png|thumb|right|500px|Instructions to take action if text matches an address.]]
