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Full Discussion: Perl open(CMD, "cmd |"); buffering problem..
Top Forums Shell Programming and Scripting Perl open(CMD, "cmd |"); buffering problem.. Post 302593140 by Shawn, Lee on Wednesday 25th of January 2012 08:11:37 PM
Old 01-25-2012
Perl open(CMD, "cmd |"); buffering problem..
Hello,

There's a third-party application's command that shows the application's status like "tail -f verybusy.log". When use the command, the output comes every 1-sec. but when it goes in a script below the output comes every 8-sec...What is the problem and how can I fix it?

Code:
open(CMD, "/appbin/command |");
while(<CMD>){
        print;
}
close(CMD);

Thanks,
 

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LEARN ABOUT OPENSOLARIS

card

CARD(1) 								FSF								   CARD(1)

NAME

       card - print reference card of program options

SYNOPSIS

       card [OPTION]... PROGRAM...

DESCRIPTION

       Print a reference card of the PROGRAMs thanks to their inline help.

OPTIONS

       -h, --help
	      display this help and exit

       -v, --version
	      display version information and exit

       -o, --output=FILE
	      save the output in FILE

       -l, --language=LL
	      print the help in the language LL (default: English)

       --command=CMD
	      perform pretty-printing on the output of CMD (e.g. --command='netscape -help')

       Options for a2ps are given after `--', for instance

	      $ card -lfr a2ps -- -Pdisplay -4

       News, updates and documentation: http://www.inf.enst.fr/~demaille/a2ps/

AUTHOR

       Written by Akim Demaille.

REPORTING BUGS

       Report bugs to <bug-a2ps@gnu.org>.

COPYRIGHT

       Copyright (C) 1997-99 Akim Demaille, Miguel Santana
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       a2ps(1), card(1), fixps(1), pdiff(1), psset(1), texi2dvi4a2ps(1).

       The full documentation for card is maintained as a Texinfo manual.  If the info and card programs are properly installed at your site,  the
       command

	      info card

       should give you access to the complete manual.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+----------------------+
       |  ATTRIBUTE TYPE    |	ATTRIBUTE VALUE    |
       +--------------------+----------------------+
       |Availability	    | SUNWa2psu SUNWa2psr  |
       +--------------------+----------------------+
       |Interface Stability | External		   |
       +--------------------+----------------------+
NOTES

       Source for a2ps is available on http://opensolaris.org.

card 1.3 (GNU a2ps 4.13)					   February 2000							   CARD(1)
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