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Re: gracebat runs in X, but not as a system call from a perl script


On Wed, 21 Feb 2007, moka wrote:

> I do startxwin to open X and  then do
> gracebat <parameters>
> this does what I want, namely produce a jpeg file
>
> Now if I try this for a perl script(run from X)
> system(gracebat <parameters>)
>
> i.e. the exact same line that produced the right result
> I get an error.
>
> I guess the reason is that I am using the activestate perl instead of the
> cygwin
>  perl; anyway there were reasons for that, not sure if valid or not[the reason
>  was getting DBD::Oracle to work, which was a huge pain].
> So I guess "system" to perl is whatever system Activestate was installed for,
> i.e. Windows.
>  The question is:
> Is it possible to get around this?
> Can I tweak the system command so that it executes  gracebat(but
>  otherwise use Activestate, e.g.  for Oracle DBI queries?

As the package list shows (I don't have grace installed), gracebat is a
symlink.  A Windows program like ActiveState Perl will not understand
Cygwin's symlinks (nor will it run a shell script, since it uses cmd as
its shell).  The easiest thing you can do is invoke a Cygwin shell (bash,
sh, pdksh, etc) and let it run the command.  That way, no matter what the
command is (an executable, or a symlink, or a shell script), the shell
will interpret it for you and invoke it properly.

Be careful with quoting -- you may want to use the list form of
system()...
	Igor
-- 
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