Sure, here's a zsh command that renames all files in the current working directory from kebab case to snake case:

for file in *; do mv $file ${(L)file//[-]/_}; done 

This command loops through all files in the current directory and uses the mv command to rename each file. The $(L) modifier converts the file name to lowercase and the ${//[-]/_} parameter expansion replaces all hyphens (-) with underscores (_) in the file name.

To run this command, you need to have zsh installed on your system. In Arch Linux, zsh is available in the official repositories and can be installed using the following command:

sudo pacman -S zsh 

There are no additional packages required to run this particular command.
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