Search Text File In UNIX

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How do I search the input text files for lines matching given words or strings under UNIX operating systems?

To search for a particular word or string in a file, use the grep command.

Syntax

The basic syntax of the grep command is as follows:

grep string fileName
grep word fileName
grep "word1 word2" fileName

Examples

For example, to find Vivek Gite’s email id, type grep, and the file containing the information:

grep Vivek users.txt
grep "Vivek Gite" users.txt
grep "Gite" users.txt

Sample outputs:

Vivek Gite    123-455-676 [email protected]

To search word apple in all text file (*.txt) enter:

grep apple *.txt

You can also search for lines without a certain words. For example, display all line that do not contain the word “usb”

grep -v "usb" *

See more grep command examples here.

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

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