09-27-2010
Quote:
Originally Posted by
Mercfh
How can I tell if this is working (i mean i'll take your word for it)......but just curious.
Try running a 'sleep 60 &' then a 'ls'. If it works, it won't wait a full minute for the sleep to finish before running ls.
Quote:
Dont I need the children to spawn like grandchildren?
Nope. You've already created a child with
fork(). Fork clones a process, creating an
independent copy that's almost identical except for fork()'s return value. Your identical copy goes and does what it wants while your main one does what it wants -- that is, your copy replaces itself with a command via
exec, while your main program waits for it to finish.
Quote:
maybe im not exactly sure how background processing is working in this aspect.
The point is, it was in the background all along. The only reason it waits is because you call wait().
Last edited by Corona688; 09-27-2010 at 07:58 PM..
This User Gave Thanks to Corona688 For This Post:
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi,
I am a newbie learing Unix , I have started with teh book "the Design of the Unix OS" by Bach.After which I plan to read "UNIX Network Programming" by Richard Stevens.
What is the background that one needs to learn unix. I know C. But I am not sure about my Operating Systems... (4 Replies)
Discussion started by: ramyar
4 Replies
2. UNIX Desktop Questions & Answers
Hi,
I'm new to this forums and to Unix OS...
Is this the right place to put this thread?
I just need to ask how to set the wallpaper that goes through the x-term windows in a Unix system? It's as if the x-term windows is transparent...
I tried modifying the .login file and things got... (5 Replies)
Discussion started by: Gri3v3r7
5 Replies
3. Shell Programming and Scripting
I have a friend at work that asked me a question today and I figured I would seek help here. How does a shell script know whether it is running in the background or not?
Thanks in advance for help (5 Replies)
Discussion started by: Moofasa
5 Replies
4. Shell Programming and Scripting
How can I run a shell in the background?
cat test.sh
#!/bin/sh
sleep 600
Thank u very much indeed! (2 Replies)
Discussion started by: GCTEII
2 Replies
5. Linux
I have script 3 scripts
1 parent
2 children
child1
child2
In the code below the 2 child processes fire almost Instantaneously in the background, Is that possible to know the status of pass/fail of each process "as it happens" ?
In the present scenario although Child2... (5 Replies)
Discussion started by: jville
5 Replies
6. Shell Programming and Scripting
I have script 3 scripts 1 parent (p1) and 2 children child1 and child2
I have script 3 scripts
1 parent
2 children
child1
child2
In the code below the 2 child processes fire almost Instantaneously in
the background, Is that possible to know the status of pass/fail of each
process... (12 Replies)
Discussion started by: jville
12 Replies
7. Shell Programming and Scripting
NOTE: I am using BASH and Solaris 10 for this.
Currently in the process of building a script that has a main "watcher" daemon that reads a configuration file and starts background processes based on it's global configuration. It is basically an infinite loop of configuration reading. Some of the... (4 Replies)
Discussion started by: dcarrion87
4 Replies
8. Programming
Hello,
I extracted a list of files in a directory with the command ls . However this is not my computer, so the ls functionality has been revamped so that it gives the filesizes in front like this :
This is the output of ls command : I stored the output in a file filelist
1.1M... (5 Replies)
Discussion started by: ajayram
5 Replies
9. Shell Programming and Scripting
Hi,
I am using ksh , i have requirement to run 4 functions in background , 4 functions call are available in a case that case is also in function, i need to execute 1st function it should run in background and return to case and next i will call 2nd function it should run in background and... (8 Replies)
Discussion started by: karthikram
8 Replies
10. Shell Programming and Scripting
we are getting files on daily basis.we need to process these files.
i need a unix shell script where we can count
1-The no of files processed
2-No of data/record processed for each files.
The script should log these details into a database table. If there is any error while file... (3 Replies)
Discussion started by: Atul kumar
3 Replies
wait(1) General Commands Manual wait(1)
NAME
wait - await process completion
SYNOPSIS
[pid]
DESCRIPTION
If no argument is specified, waits until all processes (started with of the current shell have completed, and reports on abnormal termina-
tions. If a numeric argument pid is given and is the process ID of a background process, waits until that process has completed. Other-
wise, if pid is not a background process, exits without waiting for any processes to complete.
Because the system call must be executed in the parent process, the shell itself executes without creating a new process (see wait(2)).
Command-Line Arguments
supports the following command line arguments:
The unsigned decimal integer process
ID of a command, whose termination is to wait for.
WARNINGS
Some processes in a 2-or-more-stage pipeline may not be children of the shell, and thus cannot be waited for.
SEE ALSO
csh(1), ksh(1), sh-posix(1), sh(1), wait(2).
STANDARDS CONFORMANCE
wait(1)