-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Florian Kulzer wrote: > 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 >
You are right. Here for me: $ ls -l /etc/alternatives/java lrwxrwxrwx 1 root root 34 2007-04-11 21:16 /etc/alternatives/java -> /usr/lib/jvm/java-gcj/jre/bin/java $ ls -l /usr/lib/jvm/java-gcj/jre/bin/java lrwxrwxrwx 1 root root 26 2007-02-04 02:04 /usr/lib/jvm/java-gcj/jre/bin/java -> ../../../../../bin/gij-4.1 > 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.) > That is what exactly I do now. > 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. > - -- Cheers, Wei Chen http://www.acplex.com/people/wchen/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFGKgDXCIqXQV6BF28RAjiuAKCX2VOEnZ3TOi4AOCJ4lL79nKL7TwCgnyb5 HlpbDor+U+fgBtxrCQZBEYs= =mXFK -----END PGP SIGNATURE----- -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
