How would this command be interpreted?

A nice alternative to which is type. They are similar, in that they both indicate how an argument keyword would be interpreted if used as a command name, but the output is different:

$ which ruby
/Users/jwworth/.rvm/rubies/ruby-2.1.0/bin/ruby
$ type ruby
ruby is /Users/jwworth/.rvm/rubies/ruby-2.1.0/bin/ruby

I prefer the type syntax, especially with multiple arguments:

$ type ruby rails bundler
ruby is /Users/jwworth/.rvm/rubies/ruby-2.1.0/bin/ruby
rails is /Users/jwworth/.rvm/gems/ruby-2.1.0/bin/rails
bundler is /Users/jwworth/.rvm/gems/ruby-2.1.0/bin/bundler

Type includes a handy -t flag, which tells you what type of thing the result is:

$ type -t type
builtin
$ type -t ruby
file

See help type (in Bash) for more information.

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