CODE EXAMPLE FOR SHELL

xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

$ xcode-select --install
$ sudo xcode-select --reset
$ sudo xcode-select -s /Library/Developer/CommandLineTools

Note: In case you have Xcode installed, 
you may need to specify Xcode directory in this case, 
it should be something like this

$ xcode-select -s /Applications/Xcode.app