David Gamey wrote:
> And is there an easy way to reference both?
Define "easy". :)
I have to run tests using several versions of Java and
so took some time to set up some Z-shell functions to
make switching between them easier. But this is on
Linux (and zsh, obviously) and I've never looked at
other environments.
I can switch between java versions with a single command.
For example, to use Sun's JDK 1.6, I type:
-> jset6
and then just run 'javac' and 'java' normally (including
from inside other scripts).
Here's the jset6 function:
-------------------------------------------
#(name) jset6 - set up for using Java 1.6
jset6() {
if [ -z "${CLASSPATH_PREFIX}" ]; then
setenv CLASSPATH_PREFIX "."
fi
if [ ! -z "${JAVA_HOME}" ]; then
# Clear remnants of previous JAVA
delenvp PATH ${JAVA_HOME}
delenvp CLASSPATH ${CLASSPATH_PREFIX}
delenvp CLASSPATH ${JAVA_HOME}
fi
setenv JAVA6 /opt/java6
setenv JAVA_HOME=$JAVA6
addenv CLASSPATH ${JAVA_HOME}/jre/lib/jrt.lib
addenv CLASSPATH ${CLASSPATH_PREFIX}
addenv PATH ${JAVA_HOME}/bin
}
-------------------------------------------
setenv, delenvp, and addenv are the functions that do
the heavy listing (well, delenvp and addenv are, setenv
just wraps 'export' so the call aligns with the other two).
delenvp removes all 'path' entries containing the 2nd argument from the
value of the variable named in the first argument. Here, "path entries"
are assumed to be colon separated.
addenv prepends the second argument as a path entry on the value of
of the variable named in the first argument, *provided* that entry
isn't already on the PATH somewhere.
I have similar functions jset4 and jset5.
Given the primitive functions, it would be easy to do something
similar to allow switching between Icon and Unicon. (I use them
to switch among other tasks as well as switching versions of Java.)
If you're curious about the implementations of addenv and delenvp
I can pass those on, but they are pretty zsh-specific. I have no
idea what it would take to do something similar with a different
shell [or under Windows].
--
Steve Wampler -- [email protected]
The gods that smiled on your birth are now laughing out loud.
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