#!/bin/bash
gcc -o program program.c
nohup ./program &sleep 120 #sleep for 2 minspid=$(ps -ef | grep program | grep -v grep | cut -d" " -f3,3)
Here we are trying to get PID of a child process in parent process. So I believe, it can be done only if child process runs in background. If process runs in foreground, ps command will execute only after child process is completed and then PID can't be obtained.
sleep is used to avoid cases when child process make take a while to get started.
~Others, Please correct if anything wrong here.
Last edited by anurag.singh; 12-21-2010 at 12:47 PM..
hi,
I am new ot unix. So, can i write a shell(c shell or korn shell) program to access internet? I mean if I run the program, it can access specified url and then copy the html to a file? Can anyone help me? And how can make the program runs every 1 hr?
new comer (2 Replies)
Hi,
i want to write a script that executes a program (exec?) .
this program then requires a filename as input.
how do i give it this input in the script so the program will be complete run and close by the script.
e.g.
exec prog.exe
program then asks for filename
"enter filename:"... (1 Reply)
Hi,
I am a complete newbie for unix. I have just installed mysql on my MAC. I was wondering every time I wanted to use mysql I had to ./mysql or sh mysql everytime on /usr/local/bin/mysql/bin. How can I execute the mysql program without using ./ or sh. I chmod +x already. And what do I have to... (3 Replies)
Hi All,
well , i am facing this problem.. i have tried a few sample codes but there isn't any solution . could anyone please give a sample code as of how to do this...
Please see the below details...and read the details carefully.
I have written some code, logic is
1)from... (4 Replies)
Hello,
I have a c program executable which I need to run inside a shell script.
But the c program runs in a subshell because of which all the actions done by the c program is not available to the current shell.
Is there any way to execute a C program binary executable in the current shell? (4 Replies)
My professor gave me a code with no errors.
When I compile it's fine, it doesn't show any errors, but when I try to execute it shows this:
line 3: syntax error near unexpected token '('
line 3: 'int main()'
I searched through the Internet but I couldn't find any solution. Please!!!... (1 Reply)
Hi there,
When I am trying to execute any shell script.
The shell script only execute line 1 and I notice that the rest o the program was not executed. Please advise.
# bash +x vmscript-4.sh
Even when I enter this command there is not output.
sudo su
cd /tmp
cp... (2 Replies)
Discussion started by: alvinoo
2 Replies
LEARN ABOUT DEBIAN
io::async::pid
IO::Async::PID(3pm) User Contributed Perl Documentation IO::Async::PID(3pm)NAME
"IO::Async::PID" - event callback on exit of a child process
SYNOPSIS
use IO::Async::PID;
use POSIX qw( WEXITSTATUS );
use IO::Async::Loop;
my $loop = IO::Async::Loop->new;
my $kid = $loop->fork(
code => sub {
print "Child sleeping..
";
sleep 10;
print "Child exiting
";
return 20;
},
);
print "Child process $kid started
";
my $pid = IO::Async::PID->new(
pid => $kid,
on_exit => sub {
my ( $self, $exitcode ) = @_;
printf "Child process %d exited with status %d
",
$self->pid, WEXITSTATUS($exitcode);
},
);
$loop->add( $pid );
$loop->run;
DESCRIPTION
This subclass of IO::Async::Notifier invokes its callback when a process exits.
For most use cases, a IO::Async::Process object provides more control of setting up the process, connecting filehandles to it, sending data
to and receiving data from it.
EVENTS
The following events are invoked, either using subclass methods or CODE references in parameters:
on_exit $exitcode
Invoked when the watched process exits.
PARAMETERS
The following named parameters may be passed to "new" or "configure":
pid => INT
The process ID to watch. Must be given before the object has been added to the containing "IO::Async::Loop" object.
on_exit => CODE
CODE reference for the "on_exit" event.
Once the "on_exit" continuation has been invoked, the "IO::Async::PID" object is removed from the containing "IO::Async::Loop" object.
METHODS
$process_id = $pid->pid
Returns the underlying process ID
$pid->kill( $signal )
Sends a signal to the process
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2012-10-24 IO::Async::PID(3pm)