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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 MOJAVE

install-solaris

install-solaris(1M)                                                                                                            install-solaris(1M)

NAME

       install-solaris - install the Solaris operating system

SYNOPSIS

       install-solaris

       install-solaris  invokes  the  Solaris  Install  program. Depending on graphical capability and available memory at the time of invocation,
       install-solaris invokes either a text-based installer or a graphical installer.

       The following minimum requirements for physical memory dictate which features are available during installation:

       For SPARC machines:

       128 MB

           Minimum physical memory for all installation types

       128 MB

           Minimum physical memory required for windowing system

       384 MB

           Minimum physical memory required for graphical-based installation

       For x86 machines:

       256 MB

           Minimum physical memory for all installation types

       256 MB

           Minimum physical memory required for windowing system

       512 MB

           Minimum physical memory required for graphical-based installation

       In some cases, even if the minimum physical memory is present, available virtual memory after system startup can limit the number  of  fea-
       tures available.

       install-solaris  exists  only  on  the Solaris installation media (CD or DVD) and should be invoked only from there. Refer to the  for more
       details.

       install-solaris allows installation of the operating system onto any standalone system. install-solaris loads the software available on the
       installation media. Refer to the  for disk space requirements.

       Refer to the  for more information on the various menus and selections.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcdrom  (Solaris instal-  |
       |                             |lation media)                |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Evolving                     |
       +-----------------------------+-----------------------------+

       pkginfo(1), install(1M), pkgadd(1M), attributes(5)

       It is advisable to exit install-solaris by means of the exit options in the install-solaris menus.

                                                                    23 Sep 2005                                                install-solaris(1M)
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