Uninstalling programs installed to /opt

As they cannot be uninstalled in the usual way by using apt, or in this case, rpm
commands, can one simply delete the program directory ?

Eg. I have installed both sun jre 1.6.0_11 and now the latest jre 1.6.0_12 in /opt
(on CentOS). My browser links for Firefox and Opera point to the new version.

I assume that, bar the links, the jre installs mentioned are self-contained
in their respective directories in /opt, and that I can safely delete the older
version.

Please advise whether this is OK or not. Thanks and regards.

EDIT: I am talking about .bin files. i.e. files that cannot be installed with the package managers.

 

Hello,
You can check by running find or locate java and see what comes up.
Furthermore, in general, you can delete the files, but you may have a few broken links here and there. /opt usually goes for local installs.
Mrk

 

All's OK, but is there a way to remove the obsolete entry in /usr/bin/alternatives
(i.e the jre1.6.0_11) ?
[root@localhost /]# usr/sbin/alternatives --config java

There are 3 programs which provide 'java'.

Selection Command
-----------------------------------------------
* 1 /usr/lib/jvm/jre-1.4.2-gcj/bin/java
2 /opt/jre1.6.0_11/bin/java
+ 3 /usr/java/jre1.6.0_12/bin/java

Enter to keep the current selection[+], or type selection number:
[root@localhost /]#

The version the browsers are using =

[root@localhost /]# java -version
java version "1.6.0_12"
Java(TM) SE Runtime Environment (build 1.6.0_12-b04)
Java HotSpot(TM) Client VM (build 11.2-b01, mixed mode, sharing)
[root@localhost /]#

I suppose I could just leave as is ?

 

Looks messy ... just leave it ...
Mrk

 

OK. No probs. with java, so will leave as is. I could of course just have left
the older version installed as well - as a functioning 3rd. alternative.
Thanks.