How to Use Awk and Regular Expressions to Filter Text or String in Files

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Aaron Kili

Aaron Kili is a Linux and F.O.S.S enthusiast, an upcoming Linux SysAdmin, web developer, and currently a content creator for TecMint who loves working with computers and strongly believes in sharing knowledge.

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31 Responses

  1. ROBSON MASSAKI KOBAYASHI says:

    “Using Awk with (*) Character in a Pattern

    It will match strings containing localhost, localnet, lines, capable, as in the example below:”

    I think capable not match, but the whole line.

  2. Erick Manuel Bazán says:

    Amazing tutorial , thanks a lot, I have a question.

    I have a file (testFile) with the following content:

    one:two:three
    three:two:one
    

    I’m running this command as a test where after looking for the pattern I want a message telling me wheter or not it found matches .

    awk ‘/^z/{print} {if (NR == 0) {print “No matches found”} else {print “There are matches”} }’ testFile

    Since there are no lines matching the pattern, I’m expecting the “No matches found” message, but it shows “There are matches“.

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