An fd trick

Written by (Remy Sharp) / Original link on Aug. 12, 2019

If you followed my CLI improved then you'll know I'm a fan of the fd command which I'm able to use for a mass git file rename.

Doing a mass rename is typically simple in the command line (mv *.mjs *.js - though I'm not sure off the top of my head if this will recurse directories, probably not), but doing a mass rename with git is harder, especially as there's some kind of locking going on. This means that the mass git rename must be run sequentially.

In my particular recent case, I wanted to rename all instances of .mjs files (excluding node_modules) to .js. I've tried this before with xargs and kept failing but fd makes it pretty easy.

The fd command allows you execute a command against the results (similarly to xargs) and usefully fd also provides some useful additions for filename substitution:

Armed with this information, I can find all mjs files -e mjs, and I can execute git mv with the full path to the result as the first argument and the {.} placeholder for the filename excluding the extension:

fd -e mjs -x git mv {} {.}.js -j1

The final argument (as above) is -j1 which tells fd to run the commands in a single thread (by default fd will run multiple threads - I don't recall how many) - this is important because git will lock and unlock the git metadata files upon each rename.

Otherwise, that's it. A single command to git rename.

Originally published on Remy Sharp's b:log


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