Hi David,
How does the $PATH and the shell() function work?
That is the path as you get from:
put $PATH
or
put shell("echo $PATH")
does not correspond with what you get if you try the same from the
shell. This is presumably because these are set by various bash
scripts when a terminal starts and Rev does not do this?
OK - but how does Rev do this exactly, which $PATH does if take,
and what happens when you set the PATH from inside Revolution -
this is important as shelling to programs does not work unless they
are on the PATH.
All variables that are prefixed by '$' are directly linked to their
corresponding environment variables. So the values you see from
within a Revolution application are what has been passed to the
process by the OS.
In particular, the PATH variable will often differ from that which
you see in a Terminal window because after the terminal launches it
runs an interactive shell. Interactive shells (such as bash)
typically have their own configuration that augments the PATH variable.
In terms of setting such variables then the only thing to remember is
that environment variables are passed from parent process to child
process but not the other way around. So the OS gives Revolution its
own set of environment variables, which you can modify, and
Revolution will then pass the same values (including modifications)
on to any child processes it launches - in particular, ones run using
shell.
So, all you need to do to change the paths that the shell command
looks in is to set the $PATH variable to the required list before
using the shell function.
Hope this helps,
Mark.
------------------------------------------------------------------
Mark Waddingham ~ [EMAIL PROTECTED] ~ http://www.runrev.com
Runtime Revolution ~ User-Centric Development Tools
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