Ruby sidebar: Using rvm on the shebang (#!) line in a script
May 4, 2012
3 Comments »
Just throwing this up here because I didn’t find it elsewhere.
I want to run ruby scripts from the command line or in a cronjob, and I do not want to always have to type “ruby scriptname”.
But, I use rvm. I want to run a particular ruby, maybe identified by an alias, maybe with a specific gemset.
It turns out you can use the env program with rvm do to accomplish this.
- #!/usr/bin/env rvm 1.9 do ruby
- require 'mygem'
- o = MyGem.new
- # blah blah blah
In this example, 1.9 is the name of the ruby (actually, an rvm alias) I want to use, and it could just as easily specify a gemset as well (e.g., 1.9@mygems).
If you’re running in cron, don’t forget you need to load the environment variables first. Here I use the bash . command to source my .bashrc.
54 9-16 * * 1-5 . /Users/dueberb/.bashrc; /Users/dueberb/bin/exercise
Nothing fancy, but worth knowing.
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