Experimental Physics and
Industrial Control System

[email protected] · Wed, 14 Jun 95 08:56:03 -0400

>I don't like the $PATH concept.  When a new version of something comes out, 
>$PATH is almost always in the wrong state when you want to flip back and forth
>between the two.  It is too hard to change things in the middle of $PATH.  

CEBAF's setup scripts actually replace things in the middle of $PATH (i.e.,
delete the old reference and add the new).  You can flip versions multiple
times without messing up path.  Our users do wish it were a little
quicker, though.  It's performance is limited by the fact that it must be
a source'd script to effect the current shell.  Setup epics takes over 10
seconds to a remote file system.  It recursively calls setup p3, gnu, & gcc.
If the recursion were removed, it would be faster.  To a local file system
it takes about 8 seconds with recursion.

Chip

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System