STDERR is not necessarily the same thing as file descriptor 2 (and it isn't after you do *STDERR = *OLDERR;). For commands executed by system, file descriptor 2 is stderr. They have no knowledge of the file descriptor associated with your program's STDERR variable.

Replace
*STDERR = *OLDERR;
with
open STDERR, ">&OLDERR";

Update: s/3/2/g. Thanks nobull.

In reply to Re: Suppress/Reactivate STDERR by ikegami
in thread Suppress/Reactivate STDERR by saintmike

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