On Sat, Apr 21, 2007 at 13:59:41 +0800, Wei Chen wrote: > > Douglas Allan Tutty wrote: > > On Fri, Apr 20, 2007 at 07:26:37PM +0800, Wei Chen wrote: > >> We now have system level `update-alternatives' mechanism that can be > >> used by root to maintain symbol links in `/etc/alternatives'. Is it > >> useful/interesting to extend its use to user level, i.e. to maintain > >> similar symbol links in `~/bin' or something like `~/bin/alternatives'? > >> Or does that already exist? I personally think it can be useful, because > >> I currently do that manually. > > > > Just set aliases in your .bash_aliases file. > > > > That is not always convenient. I want to switch between gcj's VM and > compiler and sun's for one account. The names of the executables are the > same, i.e. `java' and `javac'.
No, they are not. Just follow the symlinks: $ which java /usr/bin/java $ ls -l /usr/bin/java lrwxrwxrwx 1 root root 22 2007-03-18 13:20 /usr/bin/java -> /etc/alternatives/java $ ls -l /etc/alternatives/java lrwxrwxrwx 1 root root 24 2007-03-18 13:20 /etc/alternatives/java -> /usr/bin/gij-wrapper-4.1 $ file /usr/bin/gij-wrapper-4.1 /usr/bin/gij-wrapper-4.1: perl script text executable If you select Sun's JVM via the alternatives system then the /etc/alternatives/java symlink will simply be pointing to another executable. As Douglas has suggested, you could define aliases for "java" etc. which translate to the real executables, e.g. alias java='/usr/bin/gij-wrapper-4.1' You could also create your own ~/alternatives directory, add it as the first element of your $PATH and put a symlink there, like so: $ which java /usr/bin/java $ ln -s /bin/date ~/.bin/java $ which java /home/florian/.bin/java $ java Sat Apr 21 13:22:05 CEST 2007 (I have ~/.bin in my $PATH for my own scripts.) Of course you can also just type /usr/bin/gij-wrapper-4.1 explicitly on the command line to make sure which JVM is used. -- Regards, | http://users.icfo.es/Florian.Kulzer Florian | -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
