06-15-2006
what does if[$? -ne 0] mean in unix
Hi,
what does this mean in unix
if [$? -ne 0]
I understand ne is not equal to zero but how abt $?
Also, what does exit 1 or exit 0 mean.
Last edited by shree; 06-15-2006 at 01:16 PM..
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LEARN ABOUT DEBIAN
child::link::proc
Child::Link::Proc(3pm) User Contributed Perl Documentation Child::Link::Proc(3pm)
NAME
Child::Link::Proc - Proc object used by Child.
SEE ALSO
This class inherits from:
Child::Link
METHODS
$bool = $proc->is_complete()
Check if the child is finished (non-blocking)
$proc->wait()
Wait until child terminates, destroy remaining zombie process (blocking)
$proc->kill($SIG)
Send the $SIG signal to the child process.
NOTE: kill() is unpredictable on windows, strawberry perl sends the kill signal to the parent as well as the child.
$proc->pid()
Returns the process PID.
$proc->exit_status()
Will be undef unless the process has exited, otherwise it will have the exit status.
Note: When you call exit($N) the actual unix exit status will be bit shifed with extra information added. exit_status() will shift the
value back for you. That means exit_status() will return 2 whun your child calls exit(2) see unix_exit() if you want the actual value
wait() assigned to $?.
$proc->unix_exit()
When you call exit($N) the actual unix exit status will be bit shifed with extra information added. See exit_status() if you want the
actual value used in exit() in the child.
HISTORY
Most of this was part of Parrallel::Runner intended for use in the Fennec project. Fennec is being broken into multiple parts, this is one
such part.
FENNEC PROJECT
This module is part of the Fennec project. See Fennec for more details. Fennec is a project to develop an extendable and powerful testing
framework. Together the tools that make up the Fennec framework provide a potent testing environment.
The tools provided by Fennec are also useful on their own. Sometimes a tool created for Fennec is useful outside the greator framework.
Such tools are turned into their own projects. This is one such project.
Fennec - The core framework
The primary Fennec project that ties them all together.
AUTHORS
Chad Granum exodist7@gmail.com
COPYRIGHT
Copyright (C) 2010 Chad Granum
Child is free software; Standard perl licence.
Child is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the license for more details.
perl v5.10.1 2011-03-07 Child::Link::Proc(3pm)