Waiting for an arbitrary background process (limiting number of jobs running)
Hi,
I'm trying to write a script to decompress a directory full of files. The decompression commands can run in the background, so that many can run at once. But I want to limit the number running at any one time, so that I don't overload the machine.
Something like this:
At the marked spot, I want to wait for one of my background processes to complete. I don't mind which one, but I do want to wait for just one.
wait doesn't work, as it waits for all jobs to complete. On the other hand, wait N doesn't work, because I don't know which job will finish first.
I could use trap "..." 20, but I'd need to be able to pause my script at the XXX line and be able to resume it via the "..." from the trap command. I can't think of a way of doing this ("suspend" in bash might work, but really I need this to work in ksh - I'm not sure the server this will ultimately run on has bash installed).
I'm trying to install a solaris 9 patch cluster and when I try to use & to run in background it won't allow me to enter in my sudo password so it fails the install and sudo auth. Does Solaris not have screen like linux? If & will work what am I doing wrong?
sudo ./install_cluster -q &
is... (3 Replies)
I have the following sample script to run a script the jobs with the same
priority(in this case field3) in parallel; wait for the jobs to finish
and run the next set of jobs in parallel.When all the lines are read
exit the script.
I have the following script which is doing evrything I want... (1 Reply)
i need to execute 5 jobs at a time in background and need to get the exit status of all the jobs i wrote small script below , i'm not sure this is right way to do it.any ideas please help.
$cat run_job.ksh
#!/usr/bin/ksh
####################################
typeset -u SCHEMA_NAME=$1
... (1 Reply)
Hi All,
I have requirement. I am running a job every 30mins. before starting the process, i need to check the process, if the process is still running then i need not trigger the process again, if it is not running then trigger the process again. I am using cron to trigger the shell script. Can... (7 Replies)
Hello,
I am a novice shell script programmer. And facing this problem any help is appreciated.
I m writing a shell script and running few commands in it background as I have to run them simultaneously.
Sample code :
sql_prog &
sql_prog &
sql_prog &
echo "Process Completed"
Here... (2 Replies)
Hi,
I have on shell script which internally calls more than one scripts which run in background.
These scripts cannot be modified to run in foreground.
eg. myscript.sh -> bulk_launcher.sh -> acq_launcher.sh
-> bulk_loader.sh
I want the calling shell script myscript.sh to wait till the... (7 Replies)
Hello,
I am running GNU bash, version 3.2.39(1)-release (x86_64-pc-linux-gnu). I have a specific question pertaining to waiting on jobs run in sub-shells, based on the max number of parallel processes I want to allow, and then wait... (1 Reply)
Hi ,
I want to see all the background process that are running in unix box machine...please guide me is there any specific command for that..since I am executing some scripts at background..!!:confused: (1 Reply)
Hi,
I have this simple c program that creates duplicate process with fork():
#include <sys/types.h>
main()
{
if (fork() == 0)
while(1);
else
while(1);
}
I tried running it in the background
gcc -o test first.c
test &
And I got this list of running process: (4 Replies)
Discussion started by: uniran
4 Replies
LEARN ABOUT HPUX
wait
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)