07-09-2008
Increment variable stored in a file
Hi,
I want to write a perl script, which will increment number stored in file. I want to do this without any file handles. I think we have to use some UNIX commands. I am not sure how to do this with file handles.
Thanks,
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LEARN ABOUT MOJAVE
io::poll5.18
IO::Poll(3pm) Perl Programmers Reference Guide IO::Poll(3pm)
NAME
IO::Poll - Object interface to system poll call
SYNOPSIS
use IO::Poll qw(POLLRDNORM POLLWRNORM POLLIN POLLHUP);
$poll = IO::Poll->new();
$poll->mask($input_handle => POLLIN);
$poll->mask($output_handle => POLLOUT);
$poll->poll($timeout);
$ev = $poll->events($input);
DESCRIPTION
"IO::Poll" is a simple interface to the system level poll routine.
METHODS
mask ( IO [, EVENT_MASK ] )
If EVENT_MASK is given, then, if EVENT_MASK is non-zero, IO is added to the list of file descriptors and the next call to poll will
check for any event specified in EVENT_MASK. If EVENT_MASK is zero then IO will be removed from the list of file descriptors.
If EVENT_MASK is not given then the return value will be the current event mask value for IO.
poll ( [ TIMEOUT ] )
Call the system level poll routine. If TIMEOUT is not specified then the call will block. Returns the number of handles which had
events happen, or -1 on error.
events ( IO )
Returns the event mask which represents the events that happened on IO during the last call to "poll".
remove ( IO )
Remove IO from the list of file descriptors for the next poll.
handles( [ EVENT_MASK ] )
Returns a list of handles. If EVENT_MASK is not given then a list of all handles known will be returned. If EVENT_MASK is given then a
list of handles will be returned which had one of the events specified by EVENT_MASK happen during the last call ti "poll"
SEE ALSO
poll(2), IO::Handle, IO::Select
AUTHOR
Graham Barr. Currently maintained by the Perl Porters. Please report all bugs to <perlbug@perl.org>.
COPYRIGHT
Copyright (c) 1997-8 Graham Barr <gbarr@pobox.com>. All rights reserved. This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
perl v5.18.2 2013-11-04 IO::Poll(3pm)