Perl script buffering (GNU Emacs FAQ For MS Windows)

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7.3.1 Perl script buffering

A handy solution for Perl scripts to the above problem is to use: 

# Turn all buffering off.
select((select(STDOUT), $| = 1)[0]);
select((select(STDERR), $| = 1)[0]);
select((select(STDIN), $| = 1)[0]);

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