Oeschey, Lars (I/ET-83, extern) <> wrote:
> Hi,
>
> I have a problem getting the output of a system call. It's a simple
> code:
>
> my $return=`$command`;
> print "$?\n";
> print "result:$return\n";
>
> (I am calling a command which actually doesn't exist, to check error
> handling)
>
> as result on the console I have:
>
> Das System kann das angegebene Laufwerk nicht finden.
> 256
> result:
>
> The first error says it can't find the program. Actually I expected
> this in $return.
>
> compared to system():
>
> my $return=system("$command");
> print "$?\n";
> print "result:$return\n";
>
> Das System kann das angegebene Laufwerk nicht finden.
> 256
> result:256
>
> So obviously system() returns the error code. But why don't the
> backticks return anything at all? Ideally I'd want all the output
> catched to log, but still be able to react on errors...
Backticks only capture output from stdout, while error messages are
generally output on stderr. In unix-like shells it usual to redirect
stderr to stdout by adding 2>&1 to the command line. I don't know if it
works the same on win32, but it might be worth a try, if that is your
platform.
Also, you could always try verifying that the command exists before
trying to run it.
HTH
--
Brian Raven
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