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Full Discussion: What Makes an App the System Default?
Top Forums UNIX for Dummies Questions & Answers What Makes an App the System Default? Post 302770437 by bakunin on Friday 15th of February 2013 09:51:55 PM
Old 02-15-2013
I notice with satisfaction you still tenaciously learn UNIX despite my efforts to let the subject look boring and hard to grasp - good!
Quote:
Originally Posted by sudon't
Code:
$ sudo gem install scrabble-solver
ERROR:  Error installing scrabble-solver:
	scrabble-solver requires Ruby version >= 1.9.2

$ which ruby
/usr/bin/ruby

$ ls -l /opt/local/bin/ |grep ruby
-rwxr-xr-x   1 root  admin     9024 Feb  6 11:21 ruby1.9
$

Why didn't ruby 1.9 become the default? How does the system determine which app is the default? I used to think it simply accepted the first one it came across in my PATH, but clearly that is not the case.
Code:
$ echo $PATH
/opt/local/bin:/opt/local/sbin:/Library/Frameworks/Python.framework/Versions/3.2/bin:/opt/local/bin:/opt/local/sbin:/sw/bin:/sw/sbin:/opt/local/bin:/opt/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/MacGPG2/bin:/usr/X11/bin

To me it looks like the problem is the name: the new ruby in "/opt/local/bin" is not named "ruby", but "ruby1.9". If you issue which ruby1.9 you would probably see this one, but if you search for "ruby", you get the one in "/usr/bin" simply because it is the only "ruby" you have.

Now, why ruby decided to install as "ruby1.9" and not as "ruby" i don' know. I don't know Macs version of UNIX at all, so i can only tell you what is the possible reason for the problem, not how to solve it.

You can, of course, try to solve the problem brute-force:

Rename "/usr/bin/ruby" to something else, say, "/usr/bin/ruby1.8". Then create a softlink:

Code:
ln -s /opt/local/bin/ruby1.9 /usr/bin/ruby

Whenever "ruby" is used, this link is followed and your new executable is used. If this works, i don't know. (There might be libraries or whatever necessary for ruby to work and it will probably not find them in any arbitrary place.) If this is not working, just delete the softlink and move the original ruby back into place:

Code:
rm /usr/bin/ruby
mv /usr/bin/ruby1.8 /usr/bin/ruby

I hope this helps.

bakunin
 

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LEARN ABOUT DEBIAN

ruby-build

RUBY-BUILD(1)															     RUBY-BUILD(1)

NAME

       ruby-build - compile and install Rubies

SYNOPSIS

       ruby-build [-v|--verbose] [-k|--keep] definition prefix
       ruby-build --definitions
       ruby-build --version
       ruby-build [-h|--help]
       rbenv install [-k|--keep] definition

DESCRIPTION

       ruby-build provides a simple way to compile and install different versions of Ruby on UNIX-like systems.

       ruby-build  downloads,  builds  and  installs the Ruby version specified in a definition into a prefix directory. Definitions can be chosen
       from the list of installed definitions or by specifying a file path for a definition.

       rbenv(1) users can also use the provided rbenv install command, which installs Rubies into the rbenv directory.

OPTIONS

       --definitions
	      List available definitions.

       -k, --keep
	      Don't delete source code after installation.

       -v, --verbose
	      Display compiler messages on standard output.

       --version
	      Show ruby-build version and exit.

       -h, --help
	      Show usage information and exit.

EXAMPLES

       Install Ruby 1.9.3 (MRI, patch level 0) to ~/rubies/mri-1.9.3

	   $ ruby-build 1.9.3-p0 ~/rubies/mri-1.9.3

       Install Ruby Enterprise Edition 1.8.7 (patch level 2011.03) for rbenv(1):

	   $ rbenv install ree-1.8.7-2011.03

       Install Ruby from a custom definition into ~/your-ruby:

	   $ rbenv install /path/to/your/own/ruby/definition ~/your-ruby

ENVIRONMENT

       CC     Sets the path to the C compiler.

       CONFIGURE_OPTS
	      Options that are passed to configure when building a Ruby.

       MAKE_OPTS
	      Options that are passed to make when building a Ruby.

       MAKEOPTS
	      Used instead of MAKE_OPTS when MAKE_OPTS is not defined.

       TMPDIR Sets the location where ruby-build stores temporary files.

       RUBY_BUILD_BUILD_PATH
	      Sets the location in which sources are downloaded and built.

AUTHORS

       ruby-build is developed by Sam Stephenson <sam@37signals.com>.

       This man page was written for the Debian GNU/Linux distribution by Sebastian Boehm <sebastian@sometimesfood.org> but may be used by others.

SEE ALSO

       rbenv(1)

								     June 2012							     RUBY-BUILD(1)
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