From: "Iñaki Baz Castillo" <ibc@...>
Date: 2009-04-05T08:58:11+09:00
Subject: Re: How to get "irb1.8" using Ruby1.8 instead of Ruby1.9.1 ?

El Domingo 05 Abril 2009, Igor Pirnovar escribió:
> What you are saying is very likely incorrect. You or someone else must
> have screwed up the links to ruby and irb in {{ /usr/bin }}. If you do
> the following you should get a similar result as I will list below:
>
>   $ cd /usr/bin/
>   $ ls -l ruby*
>   lrwxrwxrwx 1 root root    7 2009-02-27 13:52 ruby -> ruby1.8
>   -rwxr-xr-x 1 root root 3564 2008-10-09 20:19 ruby1.8
>   lrwxrwxrwx 1 root root    7 2008-10-28 12:51 ruby1.8-old-LINK ->
> ruby1.8
>   -rwxr-xr-x 1 root root 3676 2008-01-24 07:02 ruby1.9
>   -rwxr-xr-x 1 root root 6320 2007-12-07 05:09
> ruby-glade-create-template
>
>   $ ls -l irb*
>   lrwxrwxrwx 1 root root   6 2008-10-28 13:15 irb -> irb1.9
>   -rwxr-xr-x 1 root root 376 2008-10-09 20:14 irb1.8
>   -rwxr-xr-x 1 root root 376 2008-01-24 06:54 irb1.9

This is not what I clearly explained in my mail.
As I explained, I've Ruby1.8 and irb1.8 installed as DEB package, but I 
installed Ruby1.9.1 from sources setting "--prefix=/usr/bin", getting:

/usr/bin$ ls -l ruby*
-rwxr-xr-x 1 root root 5,4M 2009-03-30 22:47 ruby*
-rwxr-xr-x 1 root root 6,1K 2009-01-25 03:04 ruby1.8*
lrwxrwxrwx 1 root root    4 2009-03-30 22:55 ruby1.9 -> ruby*

/usr/bin$ ls -l irb*
lrwxrwxrwx 1 root root   6 2009-03-28 14:16 irb -> irb1.8*
-rwxr-xr-x 1 root root 314 2009-03-30 22:48 irb1.8*


This is:
- /usr/bin/ruby1.8 is the executable of Ruby 1.8.
- /usr/bin/ruby is the executable of Ruby 1.9.1.
- /usr/bin/ruby1.9 is a softlink to /usr/bin/ruby.



> As you see {{ ruby }} and {[ irb }} should be symbolic links to their
> respective version binaries. To change the the behavior you can change
> these links.

Not in my case as I've explained above.


> For instance If I wish to make my {{ irb }} to point to {{ 1.8 irb }}, I
> would do the following as {{ root }} or with the help of {{ sudo }}:
>
>   1) mv /usr/irb /usr/irb.old
>   2) ln -s /usr/bin/irb1.8 /usr/irb
>
> If you are not sure you understand the above procedure I suggest you do
> not do anything on your own without some more help from people on the
> forum. For starters you should post the results of the following here:

Sorry, but I do *really* know what a symbolic link is. Please re-read my first 
mail before assuming I'm a starter.

However I found my problem.

irb1.9 exists after compiling Ruby1.9.1 in /usr/src/ruby1.9.1-xxx/bin/irb

In /usr/bin I had:
- /usr/bin/irb --> /usr/bin/irb1.8
- /usr/bin/irb1.8

So when I installed Ruby1.9.1, /usr/bin/irb was replaced by the Ruby1.9 
version, this is, /usr/bin/irb1.8 pointed then to irb compiled in Ruby1.9.1.

I've solved it by copying the compiled irb (Ruby1.9) as /usr/bin/irb1.9 and 
re-installing the Debian irb1.8 package, so /usr/bin/irb1.8 is replaced again.

Now:

~# irb1.8
irb(main):001:0> RUBY_VERSION
"1.8.7"

~# irb1.9
irb(main):001:0> RUBY_VERSION
"1.9.1"


-- 
Iñaki Baz Castillo <ibc@aliax.net>