Looks like sh on your system is not bash (or any shell that supports the process substitution syntax).

-derby

Update: You could always force bash: 

$RT_DiffFiles= `bash -c \"comm -23 <(sort $RT_64OG_FilesPath) <(sort $
+RT_64_FilesPath)\"`;

[download]
but I'd look to see if Text::Diff accomplishes what you're after first.

In reply to Re: sh: -c: line 0: syntax error near unexpected token `(' by derby
in thread sh: -c: line 0: syntax error near unexpected token `(' by ilans11il

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