Hello,
Which command in unix can tell whether a file is being used/written by another process.
e.g. If one process is copying a very big file in some directory and there is another cronjob process which checks for a new file and in this directory and process the file. I want to check, if the... (4 Replies)
Hi,
I have a directory that is used to store files generated by another application. Each file is huge and can take some time to produce.
I am writing a shell script to check the names and dates of the files and do some functions on the ones that are not being written out.
My question is, if I... (3 Replies)
Hello All
I am attempting to write a shell script (bourne shell script) which will copy a tar'd and compressed file from a directory to a staging area but will not know whether the file is still open for write since files are being ftp's to my site at random times during the day.
Once I am... (14 Replies)
I'm using growisofs to write DVD, e.g.
$ growisofs -Z /dev/dvd -V "Personal Data, `date +"%b, %d %Y"`" -R -J /mnt/d/*
How can I test whether data was written correctly? md5sum or so? (0 Replies)
Hi experts,
I have two question about expect script
questions 1
send "tar -xjvf a.tar\r"
send "ifconfig\r"
I want to know if it just run "ifconfig after "tar -xjvf a.tar complete. or the two cmd run at the same time
question 2
after I use the expect to ssh to the... (1 Reply)
I'm wondering how programmers develop new Web Development languages because I want to learn how everything begins from the start. Let's say I'm planning to write a new language for the Web. How do I do this? Is there anyone who knows about the way Web Development languages first appear ? I'm asking... (1 Reply)
Just learned c language ,but I don't know where to start to write some applications under Linux ,I really appreciate it if anybody can help me find some books or sites on it. (2 Replies)
hi all
syslog is not getting written.
i am getting following two logs snmpd.log & authlog logs.
please tell what are two logs snmpd.log & authlog logs.
why syslog is not written. (16 Replies)
Subject: Debugging a program written in two languages
Platform: Linux (Kubuntu)
I am trying to debug a C application with bindings to some simple functions written in Ada using the GNAT Programming Studio IDE (GPS). The main entry point is in C. The debugger is gdb.
I managed to compile... (0 Replies)
Discussion started by: NiGHTS
0 Replies
LEARN ABOUT MOJAVE
io::pipe
IO::Pipe(3pm) Perl Programmers Reference Guide IO::Pipe(3pm)NAME
IO::Pipe - supply object methods for pipes
SYNOPSIS
use IO::Pipe;
$pipe = IO::Pipe->new();
if($pid = fork()) { # Parent
$pipe->reader();
while(<$pipe>) {
...
}
}
elsif(defined $pid) { # Child
$pipe->writer();
print $pipe ...
}
or
$pipe = IO::Pipe->new();
$pipe->reader(qw(ls -l));
while(<$pipe>) {
...
}
DESCRIPTION
"IO::Pipe" provides an interface to creating pipes between processes.
CONSTRUCTOR
new ( [READER, WRITER] )
Creates an "IO::Pipe", which is a reference to a newly created symbol (see the "Symbol" package). "IO::Pipe::new" optionally takes two
arguments, which should be objects blessed into "IO::Handle", or a subclass thereof. These two objects will be used for the system call
to "pipe". If no arguments are given then method "handles" is called on the new "IO::Pipe" object.
These two handles are held in the array part of the GLOB until either "reader" or "writer" is called.
METHODS
reader ([ARGS])
The object is re-blessed into a sub-class of "IO::Handle", and becomes a handle at the reading end of the pipe. If "ARGS" are given
then "fork" is called and "ARGS" are passed to exec.
writer ([ARGS])
The object is re-blessed into a sub-class of "IO::Handle", and becomes a handle at the writing end of the pipe. If "ARGS" are given
then "fork" is called and "ARGS" are passed to exec.
handles ()
This method is called during construction by "IO::Pipe::new" on the newly created "IO::Pipe" object. It returns an array of two objects
blessed into "IO::Pipe::End", or a subclass thereof.
SEE ALSO
IO::Handle
AUTHOR
Graham Barr. Currently maintained by the Perl Porters. Please report all bugs to <perlbug@perl.org>.
COPYRIGHT
Copyright (c) 1996-8 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::Pipe(3pm)