The first part of this command line, ls -l *.ps ps" that were created in the month of May: $ ls -l *.ps | grep May The following example displays files ending in ". To use grep as a filter, you must pipe the output of the command through grep. It allows you to filter out useless information from the output of commands. Grep is very often used as a "filter" with other commands. Note that grep failed in the first try because none of the entries began with a lowercase "a." 4.1.1 grep as a Filter Grep is case-sensitive that is, you must match the pattern with respect to uppercase and lowercase letters: $ grep allan extensions Note that more than one line may match the pattern you give: $ grep Allan extensions Strings may include "white space," punctuation, and invisible (control) characters.įor example, to find Edgar Allan Poe's telephone extension, type grep, all or part of his name, and the file containing the information: $ grep Poe extensions Edgar Allan Poe x72836
Where string is the word or phrase you want to find, and file is the file to be searched.Ī string is one or more characters a single letter is a string, as is a word or a sentence. The basic syntax of the grep command is: $ grep string file To search for a particular character string in a file, use the grep command.
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