Grep can search for a string in groups of files. With single or double quotation marks: $ grep "Louisa May" extensions To find a pattern that is more than one word long, enclose the string
Pipes that list through grep, looking for the pattern May: $ ls -l *.ps | grep May 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 ". Pipe the output of the command through grep. It allows you to filter out useless information from Of the entries began with a lowercase "a." 4.1.1 grep as a Filter Note that grep failed in the first try because none Pattern with respect to uppercase and lowercase letters: $ grep allan extensions Grep is case-sensitive that is, you must match the Note that more than one line may match the pattern you give: $ grep Allan extensions 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 toįind, and file is the file to be searched.Ī string is one or more characters a single letter To search for a particular character string in a file, use the grep command.
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