(TIL) Nix: Convert tabs to/from spaces
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 ...
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(TIL) Nix: Convert file contents to lower case with tr
To convert the contents of a file to all lower case, you can use:
(TIL) Nix: Combine multiple consecutive blank lines into one
cat --squeeze-blank (or cat -s for short) will suppress repeated empty output lines.
(TIL) Nix: Change Default Shell For A User
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)...
(TIL) Nix: Cat A File With Line Numbers
You can quickly view a file using cat