Re: [opensuse] Editting PATH variable

** Reply to message from G T Smith <grahamsmith@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
on Fri, 07 Sep 2007 22:16:55 +0100

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Stan Goodman wrote:
** Reply to message from G T Smith <grahamsmith@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
on Fri, 07 Sep 2007 20:27:20 +0100

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<snip>


But at the moment, there are three questions on the practical level, of which
two remain problems:

1) The jre was installed where it is by rpm without asking me; it is easy to
remove if I choose to do so; this is not a problem.

True..

2) The jdk was installed (foolishly, without thinking) in my home directory,
and I really want to remove, and to do so in such a way as not to make more
trouble for myself. The Software Management tool is of no help for this. How
should I go about removing it, so that I can reinstall from an rpm package?

I am a bit bemused by this... the SuSE install usually puts the JDK in
the Java installation tree... Did you install with YaST or with the rpm
installation tools? Yast should give you the option to remove it if it
was installed via Yast...

No. The "foolishly, without thinking" was that I did NOT install with YaST; if
I had, the answer to (2) would have been the same as for (1), and no problem
would exist. What is a safe way to remove the jdk, given that YaST is of no
help?

3) It is possible that the jdk installed by rpm will straighten out the PATH
question automatically. I would still like to know how one can revise or remove
a directory (i.e. the string between two colons) in the PATH variable. Can
someone tell me that?


Here you are talking about modifying the bash profiles... Where you make
the changes depends on whether you want the path to change globally or
for a particular user, or on login.

I would like to understand both the global and user-only cases. For each of
these, I am most interested in producing a permanent change that will survive
reboot, so what you have called "on logon".


/etc/profile for system wide configuration
~/.bash_profile ~/.bash_login or ~/.profile) for user login
~/.bashrc for non login shells

For the user login case, one can use any of the three you mention? Are these
aliases for a single file?

for a starter

these are effectively scripts and some knowledge of BASH scripting is a
good idea before attempting to modify these, (and read the BASH
documentation). Getting this wrong could make life rather interesting :-)

For Java use editing the PATH variable is NOT required...

As I have said, I am currently operating successfully with an incorrect PATH
variable. But that means that I have to specify the full pathname for the
<java> executable, whereas if the PATH were correct, I could just call it
"java". There is no difference between Java and any other executable -- one
either specifies full pathname, or needs to have a correct pointer in PATH..

I too am bemused. I think the insistence that the PATH is irrelevant comes
because you are thinking of the various java apps one might be using, rather
than the java executable. I am thinking of the latter alone, and PATH is
convenient, if not necessary.

--
Stan Goodman
Qiryat Tiv'on
Israel

From REAL answers on children's science examinations (#5):
Q: What causes the tides in the oceans?
A: The tides are a fight between the Earth and the Moon. All water tends to flow towards the moon, because there is no water on the moon, and nature hates a vacuum. I forget where the sun joins in this fight.
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