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Thread: Bash, Sed & Awk tutorials

  1. #1
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    Bash, Sed & Awk tutorials

    Hi all.

    Anyone know some really good / professional / usefull bash, awk and sed tutorials. That are up to date. I have worked with the 3 "languages" or w/e they are, on and off. But would like to get more in debt with it.

    And if anyone know of some good online tutorials, books, nuggets, others. That i'm all ears.

    Thanks on advance.
    Kind regards.

  2. #2
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    Re: Bash, Sed & Awk tutorials

    I've always found this resource to be very handy:

  3. #3
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    Re: Bash, Sed & Awk tutorials

    For sed and awk, this is the Bible.

  4. #4
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    Re: Bash, Sed & Awk tutorials

    Quote Originally Posted by Grenage View Post
    I've always found this resource to be very handy:
    Excellent link Grenage; thanks

  5. #5
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    Re: Bash, Sed & Awk tutorials

    For bash

    http://mywiki.wooledge.org/BashGuide

    Check the faq and pitfalls section as well.

  6. #6
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    Re: Bash, Sed & Awk tutorials

    You only need to learn awk out of sed/awk. Forget about sed. With awk, you can do what sed does , and much more, because Awk is a programming language itself. If you want to get more in depth on awk, look at its manual. (see my sig)

  7. #7
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    Re: Bash, Sed & Awk tutorials

    ^ i'll agree with that in a genral sense, awk is more powerful and can do everything sed can. But for a lot of smaller things, sed is far quicker. my personal favorite is

    find /dir/ -iname "fileToSub*.txt" -exec sed -i -e 's/replace/new/g' {} \+

    try to do that with awk.

    OP, "advanced bash scripting guide" is good

    set -x
    set -e

  8. #8
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    Re: Bash, Sed & Awk tutorials

    Quote Originally Posted by jerome bettis View Post
    ^ i'll agree with that in a genral sense, awk is more powerful and can do everything sed can. But for a lot of smaller things, sed is far quicker. my personal favorite is

    find /dir/ -iname "fileToSub*.txt" -exec sed -i -e 's/replace/new/g' {} \+

    try to do that with awk.
    don't forget, -exec is an option for the find command
    Code:
    find . -type f -name "file" -exec awk '{gsub(/replace/,"new")}1' "{}" > temp \; -exec mv temp "{}" \;
    true, awk doesn't have in place file editing feature, but i just showed you it can be done with just awk as well... and don't forget, sed -i also creates temp files in the back end.

  9. #9
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    Re: Bash, Sed & Awk tutorials

    Quote Originally Posted by ghostdog74 View Post
    Code:
    find . -type f -name "file" -exec awk '{gsub(/replace/,"new")}1' "{}" > temp \; -exec mv temp "{}" \;
    That will only work if there's at most one matching file. It's equivalent to
    Code:
    find . -type f -name "file" -exec awk '{gsub(/replace/,"new")}1' "{}" \; -exec mv temp "{}" \; > temp
    This'll edit the files using awk.
    Code:
    find . -type f -name "file" -exec awk '{gsub(/replace/,"new"); print > FILENAME}' {} +
    Oh and to the OP, for learning bash, stay away from the bash guides at tldp.org. Read the bash guide that nothingspecial posted. It's the only one that teaches good practice.
    Last edited by geirha; April 9th, 2011 at 01:14 PM.

  10. #10
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    Re: Bash, Sed & Awk tutorials

    Quote Originally Posted by ghostdog74 View Post
    don't forget, -exec is an option for the find command
    Code:
    find . -type f -name "file" -exec awk '{gsub(/replace/,"new")}1' "{}" > temp \; -exec mv temp "{}" \;
    true, awk doesn't have in place file editing feature, but i just showed you it can be done with just awk as well... and don't forget, sed -i also creates temp files in the back end.
    i know it can be done, but look how much more work that was. thanks for helping me prove my point so well

    bash/sed/awk are all worth learning. i've been meaning to look at some other shells one of these days zsh/ksh/csh .. ive seen some people doing even more powerful stuff over there. But i'm so used to bash it is a bit weird.

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