| Re: System Variable Behavior Changed in IDL 6.0 [message #38606 is a reply to message #38488] |
Thu, 11 March 2004 21:48   |
mperrin+news
Messages: 81
Registered: May 2001
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Member |
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Michael Wallace <mwallace.removethismunge@swri.edu.invalid> wrote:
>> Alternatively, one can just use environment variables:
>
> I knew there was an easier way!! Maybe trying to read the External
> Development Guide today has made me thing that everything must be hard!
>
>> -------
>> setenv IDL_DIR /usr/local/rsi/idl_6.0
>> #setenv IDL_DIR /usr/local/rsi/idl_5.6
>>
>> setenv LM_LICENSE_FILE $IDL_DIR/license/license.dat
>> setenv IDL_PATH +$IDL_DIR/lib:+$HOME/idl
>> -------
>
> Typically, the license directory is under $RSI_DIR, not $IDL_DIR.
Ah, OK, that must be a peculiarity of my site's installation. We've got
difference license servers running for the various different versions.
> Also,
> make sure that your $PATH is updated also so that the correct
> executables are called.
Here's where it gets really slick. If you examine
/usr/local/rsi/idl_6.0/bin/idl, you'll see that it's actually a shell
script that uses $IDL_DIR to find and then execute something like
/usr/local/rsi/idl_6.0/bin/bin.solaris2.sparc/idl
Thus _no matter which */bin/idl is in your $PATH, if $IDL_DIR is set
it will find and run the correct binary_!
I've got all of IDL 5.2 through 6.0 installed and this trick works
to switch between all of them, with the $IDL_DIR environment variable
as the only single thing that changes.
- Marshall
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