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    #!/usr/bin/perl

...
close(PIPE) or die "close pipe failed";

exit(0);
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    PIPE: out 1
PIPE: out 2
...
PIPE: err 1
PIPE: err 2
PIPE: err 3
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    out 1
out 2
...
PIPE: err 1
PIPE: err 2
PIPE: err 3