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Asked: 2026-05-28T14:56:44+00:00

I am installing Ruby on Rails on Mac OS X. The tutorial I am

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I am installing Ruby on Rails on Mac OS X. The tutorial I am following says to add:

[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm"

to ~/.bash_profile.

What does this line do?

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1 Answer

  1. Editorial Team

    [[ -s "$HOME/.rvm/scripts/rvm" ]]

    This portion is a test condition ([[ is the new test command). -s returns TRUE if the file rvm present over at $HOME/.rvm/scripts/ location exists and is of size greater than zero.

    &&

    This is a logical and operator. It executes the statement on the right IF AND ONLY IF statement on the left returns true.

    . "$HOME/.rvm/scripts/rvm"

    . is short for source command. You are sourcing the file in your current shell and not forking a new sub-shell

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