What Makes an App the System Default? Post: 302770436

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Top Forums UNIX for Dummies Questions & Answers What Makes an App the System Default? Post 302770436 by sudon't on Friday 15th of February 2013 09:07:01 PM

02-15-2013

Registered User

What Makes an App the System Default?

Hi!
I'm not sure how, (or if), Apple updates stuff in the standard unix installation of OS X, but whenever I have occasion to check a version number of something in my standard install, it is outdated. Normally, I will then install the newer version via ports, which usually becomes the default. Being a long-time Mac user, I am used to these things happening automagically, and I don't always give it much thought.
But today, I wanted to install a little Scrabble Solver script I found, and it required ruby 1.9.2, or better. I checked my version in /bin, and found I had 1.8, so I installed ruby19 via ports. Then I tried to install the script.

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

I haven't had occasion to invoke ruby myself, but I suppose other stuff uses it. Is there any reason I couldn't just set an alias to ruby 19 in my bash config? Would that solve the problem in terms of installing this script?
TIA!

sudon't

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LEARN ABOUT DEBIAN

ruby-switch

RUBY-SWITCH(1)															    RUBY-SWITCH(1)

NAME

       ruby-switch - switch between different Ruby interpreters

USAGE

       ruby-switch --list

       ruby-switch --check

       ruby-switch --set RUBYVERSION

       ruby-switch --auto

DESCRIPTION

       ruby-switch can be used to easily switch to different Ruby interpreters as the default system-wide interpreter for your Debian system.

       When run with --list, all supported Ruby interpreters are listed.

       When --check is passed, ruby-switch will check which Ruby interpreter is currently being used. If the settings are inconsistent -- e.g.
	 `ruby` is Ruby 1.8 and `gem` is using Ruby 1.9.1, ruby-switch will issue a big warning.

       When --set RUBYINTERPRETER is used ruby-switch will switch your system to the corresponding Ruby interpreter. This includes, for example,
       the default implementations for the following programs: ruby, gem, irb, erb, testrb, rdoc, ri.

       ruby-switch --set auto will make your system use the default Ruby interpreter currently suggested by Debian.

OPTIONS

       -h, --help
	   Displays the help and exits.

A NOTE ON RUBY 1.9.x
       Ruby uses two parallel versioning schemes: the `Ruby library compatibility version' (1.9.1 at the time of writing this), which is similar
       to a library SONAME, and the `Ruby version' (1.9.3 is about to be released at the time of writing).

       Ruby packages in Debian are named using the Ruby library compatibility version, which is sometimes confusing for users who do not follow
       Ruby development closely.

       ruby-switch also uses the Ruby library compatibility version, so specifying `ruby1.9.1' might give you Ruby with version 1.9.2, or with
       version 1.9.3, depending on the current Ruby version of the `ruby1.9.1' package.

COPYRIGHT AND AUTHORS

       Copyright (c) 2011, Antonio Terceiro <terceiro@debian.org>

       This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
       the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with this program.  If not, see <http://www.gnu.org/licenses/>.

								    2011-11-20							    RUBY-SWITCH(1)