Re: [opensuse] Editting PATH variable

** Reply to message from G T Smith <grahamsmith@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
on Fri, 07 Sep 2007 15:21:38 +0100

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Stan Goodman wrote:
The system is x86_64 openSuSE v10.2.

Previously, it contained jre v1.4.2, and PATH contained the string
</usr/lib64/jvm/jre/bin>.

Recently I updated to jre v1.6.0, and the new PATH string should be
</usr/java/jre1.6.0_02/bin> (but it remains as before, because I am not clear
on how to change it).

But then I decided that what I really need is a JDK, so I installed jdk
v1.6.0_02. The installer suggested installing in <~/jdk1.6.0_02/bin>, and I
accepted this. -- I am not uncomfortable with the JDK in the user directory,
with a JRE available for anyone else, so the new phrase in PATH should be
</usr/java/jre1.6.0_02/bin>, and the JDK equivalent should be in the user's
PATH.

The sources I have found from a Google search indicate that I should change the
global PATH variable by editing the file /etc/profile. But when I opened (as
root) that file, and searched for the string "jre" to find the place to edit, I
was unable to find it. Moreover, there is a warning at the top of that file
telling me that changes in the profile may not survive a system update, which
is discouraging. The fact that "jre" is not found at all is inexplicable to me,
since "jre" is known to be contained in the PATH, and I would like to
understand why it isn't present.

The 'Net offers much advice on how to add a directory to PATH by the sequence:

PATH = $PATH:<new string>
export PATH

but seems to ignore completely the question of changing existing directories.
How to go about this?


The first thing is that Java is a bit special about it handles these
things, the system path is usually irrelevant to java. JAVA_HOME is
important... as are a few other variables...

So far, I have been using full pathname to call java 1.6.0 to start java
applications (because PATH isn't correct for this version, as I said). I would,
however, like to make the needed correction, if for no other reason than to
shorten the command line in the scripts that call these apps. But I take your
point -- the other variables are important.

The jre that I installed was indeed installed through YaST from an rpm package:
<jre-1.6.0_02-fcs>, because I find it in YaST's Software Management tool. I do
not find the jdk; what is the method I need to use for removing it properly,
after which I will try to find the appropriate rpm package?

Although I removed the jre v1.4.2 package using YaST, I now find the following
two installed packages in Software Management:

jre-1_4_2-gci-compat
jre-1_4_2-gci-compat.32bit

I don't recognize these; shall I remove them, since there is no corresponding
jre?



Look at the following

/etc/java/java.conf
/etc/profile.d/alljava.sh

to get an idea of what is happening.

I would recommend using the SuSE rpms (particularly on x64 systems) as
things are a bit non standard (in a rather elegant manner).

--
Stan Goodman
Qiryat Tiv'on
Israel

REAL similes/metaphors by high school students; #19: The plan was simple, like my brother-in-law Phil. But unlike Phil, this plan just might work.
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