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/Perl 5.22

getpriority

getpriority WHICH,WHO

Returns the current priority for a process, a process group, or a user. (See getpriority(2).) Will raise a fatal exception if used on a machine that doesn't implement getpriority(2).

Portability issues: getpriority in perlport.

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http://perldoc.perl.org/5.22.0/functions/getpriority.html