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I would like to run ruby programs from anywhere. I think I have understood it is RUBYLIB. But I can't make it work. Could you give examples ?

user229044
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JCLL
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    To the none-java people that are rubyists: What is the CLASSPATH in java? :) – August Lilleaas Sep 25 '09 at 10:21
  • CLASSPATH is the ; or : separated list of directories containing *.class files or libraries (containing *.class files) for the Java VM to resolve dependencies when a class is loaded. – Peter Kofler Sep 25 '09 at 11:47
  • I take the question to mean that in Java there are a set of annoying classpath "issues." What corresponds to classpath problems in Ruby? Missing gems/what? still not really answered well, IMHO. – Thufir Mar 30 '12 at 16:06

2 Answers2

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  • You need to manupulate the load path $LOAD_PATH ($:)
  • This is done with -I directories (Directories are separated by a : on Unix-like systems and by a ; on DOS/Windows systems.)
  • You could add -I switches to RUBYOPT ($SAFE must be 0)
  • Or with RUBYLIB ($SAFE must be 0 also) which contains search paths.
  • RUBYPATH also changes search path for Ruby programs.
  • For environment variables, make sure they are proper set or exported so the Ruby VM sees them. You could add a debug print in the ruby.bat or ruby.sh.
  • Check your $SAFE setting. If you don't know about it, then its probably fine.

I allways set RUBYLIB and RUBYPATH to my loadpath and add the -S option to the interpreter call.

Peter Kofler
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There is an option -S which looks for the script using PATH environment variable.

for example doing: 

ruby -S some_script

Will look for the some_script in current operating system PATH environment variable.

Update: If your script requires other files then use the following statement:

require File.join(File.dirname(__FILE__), "name_of_required_file")

instead of:

require "name_of_required_path"
khelll
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  • Ok, the aforementioned file "some_script" is now correctly found by ruby (thx!), but this file also contains a 'require 'foo'", that is not loaded (LoadError). It resides in the same directory as the first script... Any idea ? – JCLL Sep 25 '09 at 16:19
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    To get your required file included you can do the following require File.join(File.dirname(__FILE__), "name_of_required_file") – Steve Weet Sep 25 '09 at 18:04
  • The comment code remove 2 underscores before and after the file it should be xxFILExx where x is an underscore – Steve Weet Sep 25 '09 at 18:04
  • Yes Steve's solution should work. I have updated the post to have it. – khelll Sep 25 '09 at 18:58