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zephyr@lemmy.world to Programming@programming.dev · 2 年前

How do you shell expand your variables and why?

lemmy.world

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How do you shell expand your variables and why?

lemmy.world

zephyr@lemmy.world to Programming@programming.dev · 2 年前
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  • ilega_dh@feddit.nl
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    2 年前

    find “$(echo $HOME > variable_holder.txt && cat variable_holder.txt)/$(cat alphabet.txt | grep “d”) $(cat alphabet.txt | grep “o”)$(cat alphabet.txt | grep “c”)$(cat alphabet.txt | grep “s”)”

    This is the easiest method

    • igorlogius@lemmy.world
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      2 年前

      no eval ?

    • Eager Eagle@lemmy.world
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      2 年前

      when you’re paid by character written

    • thingsiplay@kbin.social
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      2 年前

      @ilega_dh You don’t need cat in cases when grep "d" alphabet.txt can read from file too. Edit: But obviously your comment was more of a joke to over complicate it. So never mind then.

      • gendulf@kbin.social
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        2 年前

        To be safe, should probably output grep to a file, then cat that.

        • ilega_dh@feddit.nl
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          2 年前

          Agreed. Everything in Linux is a file so let’s keep it that way.

          • ImpossibleRubiksCube@programming.dev
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            2 年前

            deleted by creator

    • ale@lemmy.world
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      2 年前

      This really enterprises my bash.

    • monsterpiece42@reddthat.com
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      2 年前

      What should I search to better understand what is written here? Don’t mind learning myself, just looking for the correct keywords. Thanks!

      • oneiros@lemmy.blahaj.zone
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        2 年前

        This comment is a joke and you wouldn’t want to do it like that in reality, but here are some related keywords you could look up: “Unix cat”, “Unix pipeline”, “grep”, “output redirection”, “command substitution”.

        • monsterpiece42@reddthat.com
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          2 年前

          Perfect, I have some light reading for the evening!

      • marcos@lemmy.world
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        2 年前

        Read the Bash manual. That one patter on the GP is called “Command Substitution”, you can search for it.

        • monsterpiece42@reddthat.com
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          2 年前

          Thanks!

      • priapus@sh.itjust.works
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        2 年前

        ExplainShell should help

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