Perl not printing properly

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一生所求
一生所求 2020-12-20 02:12

Ok, so I have some sub routines similar to what you see below, my issue is that the print function is not printing out until the actual command is complete, I want it to pri

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  • 2020-12-20 02:56

    Thanks! Can you show me an example of how to use $| I am unfamiliar, this place never fails lol –

    Will this do?

    $| = 1;
    print "This is now unbuffered printing. "
    sleep 3;
    print "You no longer have to wait for the NL character. ";
    sleep 3;
    print "\n";
    
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  • 2020-12-20 03:06

    STDOUT is usually line-buffered, so you won't see your output until you print a newline. You can set $| before printing to force your output to be printed.

    To turn on autoflushing after each print, set $| to 1:

    $| = 1;
    print "Enter a number between 3 and 5: ";
    chomp( my $answer = <STDIN> );
    

    (Note that $| isn't actually a single value, it is tracked separately for each filehandle. When you set it, it affects the setting for the currently selected filehandle (see select).

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