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(TIL) Nix: Convert tabs to/from spaces

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The command expand in GNU coreutils converts tabs in each input file to spaces. The command unexpand does the reverse, converting spaces in each input files ...

(TIL) Nix: Change Default Shell For A User

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You can change the default shell program for a particular unix user with the chsh command. Just tell it what shell program you want to use (e.g. bash or zsh)...