Linux grep command

When you’re searching for a text in a particular file under a Linux system you’re usually using the grep command. grep stands for Get Regular Expression and Print, in this article we’ll show several examples of how to use it:

Using grep for a basic search

grep "textToSearchFor" file.txt

grep for a case-insensitive search

grep -i "THIS CASING DOESN'T MATTER" file.conf

grep without matching

grep -v "thisWillNotBeMatched" file.txt

grep for word matching

Usually, grep searches like how you would match a Regular Expression (as it’s in its name), if you would like to apply \b search you would use

grep -w "justThisWordWillBeMatched" file.cnf

grep for to count the number of occurrences

grep -c "howManyTimesThisAppearsInTheFile" file.php

grep with line numbers

This will show the number of the line the match is found

grep -n "whichLineIsThisOn" file.txt

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