> Hi, > I have this little test script. > The problem is the script produces > no output, unless a "\n" is added > to the print statement. > WHY?
the output is being buffered...set autoflush with this: $| = 1;
-- robert sherman css3, school of civil and environmental engineering georgia institute of technology atlanta, ga, usa
Mon, 17 May 2004 21:02:14 GMT
Steve Grazzin #2 / 4
perplexing print problem
Quote:
> Hi, > I have this little test script. > The problem is the script produces > no output, unless a "\n" is added > to the print statement.
(snip)
You can use '$|++' to unbuffer STDOUT...
By default it gets flushed on newlines.
-Steve
Mon, 17 May 2004 21:07:31 GMT
John J. Tramme #3 / 4
perplexing print problem
Quote:
> Hi, > I have this little test script. > The problem is the script produces > no output, unless a "\n" is added > to the print statement. > WHY?
Because of buffering. To turn off STDOUT buffering, set $| to 1. Or just use warn(), which is probably more appropriate.
-- After Spamtember comes Proctober.
Mon, 17 May 2004 21:05:58 GMT
Benjamin Goldber #4 / 4
perplexing print problem
Quote:
> On Thu, 29 Nov 2001 20:07:31 GMT, "Steve Grazzini"
> >> Hi, > >> I have this little test script. > >> The problem is the script produces > >> no output, unless a "\n" is added > >> to the print statement. > >(snip)
> >You can use '$|++' to unbuffer STDOUT...
> >By default it gets flushed on newlines.
> Thanks. Now a followup question please. > If perl flushes the buffer on a \n, how big can the print > buffer get before it gives an error. Would it consume > all available memory?
It doesn't "give an error." When the buffer gets full, it gets printed out. When a newline appears in the data you have to print, the buffer gets printed out. If $| is 1, the data gets buffered, but the buffer immediately gets printed out. Only when the buffer is not full, and the data you pass in via print() doesn't contain \n, does it not get immediately printed.
perplexing print problem