Macos Catalina error after update: unable to run colorls

Question

Updating to macOS Catalina gives error on opening terminal

ERROR:  Can\'t find Ruby library file or shared library colorls
usage: dirname path
/         


        

Answer 1

This fixed for me:

$ sudo gem update
$ sudo gem install colorls

Catalina now ships with Ruby 2.6, instead of 2.3. My guess is that with the upgrade, all custom installed gems became "untracked" by the new Ruby/Gem package system. With that, gem update doesn't take care of updating colorls.

Make sure you reinstall XCode command line tools, update/upgrade brew, npm and others.