Jose Torres wrote at Wed, 29 May 2002 20:30:06 +0200:
> Hi,
>
> If I'm calling the diff program from within a Perl script with something like:
>
> system("diff file1.txt file2.txt");
>
> how can I detect if there is a result or not, since if the files are identical, diff
>doesn't have
> any output? I need to be able to be able to determine if there was any output from
>within my
> script so that I can take one particular action if diff returned something (the
>files were
> different) or take another if diff didn't return anything (the files were
>identical). Thanks for
> all help with this.
>
When using the system command,
it's most better to seperate the arguments from the command.
Why ? So all shell quoting are done for you.
Assume one file comes from the win - world with spaces including or so.
Why not ? It doesn't make any effort.
So you script should change to:
if (system('diff', $file1, $file2)) {
# different
} else {
# same
}
Cheerio,
Janek
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