egrep


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egrep

(tool)
An extended version of the Unix grep command. Egrep accepts extended regular expressions (REs) including "*" following multi-character REs; "+" (one or more matches); "?" (zero or one matches); "|" separating two REs matches either. REs may be bracketed with (). Despite its additional complexity, egrep is usually faster than fgrep or grep.
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Useful command line tools are Find, Locate, Grep (general regular expression print) and its different version like Egrep, Fgrep or Rgrep.
In this step, it is useful to know the regular expression (RE) and to use Grep, Egrep, Fgrep, Find, Locate.