One (hacky) method to force each iteration of the loop to wait until usearch and all of its children have exited is to use strace -f.
A simple demonstration ...
sneaky.sh: prints 1 and exits while a sleeping subshell is left behind to print 2 at a later time.
loop.sh: runs sneaky.sh, almost certainly completing all loop iterations before any of the sleeping subshells awake.
Sample run:
loop-strace.sh: exploits the fact that strace -f does not return until all children have exited:
Sample run:
If you are interested in seeing the processes that usearch is creating and how it's managing them, use a real file instead of /dev/null.
In a korn shell script, how can I run several processes in parallel at the same time?
For example, I have 3 processes say p1, p2, p3
if I call them as
p1.ksh
p2.ksh
p3.ksh
they will run after one process finishes. But I want to run them in parallel and want to display "Process p1... (3 Replies)
Hi,
My server runnning on SUN Solaris rel.5.5.1. I have been facing this issues for years. I have some Xbase databases running on the server. User is using emulation software to telnet to server for accessing application. If user logout application abnormally - by closing windows session, then... (2 Replies)
Hi,
Would like to ask the experts if anyone knows how to run a script like this:
dtterm -title shell1
run process1 on shell1
dtterm -title shell2
run process2 on shell2
cheers!
p/s: sorry if i used the wrong forum, quite concussed after watching world cup for several nights; but I... (2 Replies)
I have the root password for my box, but I'm ignorant.
So, every time I start my computer, I have to run this command
/sbin/modprobe fuse
as su, so that I can do other stuff (like mount remote directories locally using sshfs)
I guess there's some file, like .bashrc, only it's applicable... (4 Replies)
This is my first post here so hello everyone! I know that a command of the programs name can start a program and clicking on a icon in GUI can as well as a startup shell script but how do I educate myself of the method that starts an application? Does the GUI run a script? What are the ways/ way... (2 Replies)
I would like to call a function called CIRCLE which is further beind called by other function but in a loop that CIRCLE fuction is being called. And this CIRCLE function starts another process which takes 3 hours to complete again, if i put that process in nohup &, I can go to the next command... (2 Replies)
Is there any limit in UNIX that only a MAXIMUM no of processes can run at a time? If so, it exceeds then what would be the error we would receive? (4 Replies)
Hello All,
Maybe I'm Missing something here but I have NOOO idea what the heck is going on with this....?
I have a Variable that contains a PATTERN of what I'm considering "Illegal Characters". So what I'm doing is looping
through a string containing some of these "Illegal Characters". Now... (5 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data: It's a shell script using a looping logic, trap, tput, if, while. Most of the scripts in this book aren't written... (2 Replies)
This is on a CentOS box, I have two scripts that need to run in order.
I want to write a shell script that calls the first script, lets it run and then terminates it after a certain number of hours (that I specify of course), and then calls the second script (they can't run simultaneously) which... (3 Replies)
Discussion started by: btramer
3 Replies
LEARN ABOUT CENTOS
service
service(8) System Manager's Manual service(8)NAME
service - run a System V init script
SYNOPSIS
service SCRIPT COMMAND [OPTIONS]
service --status-all
service --help | -h | --version
DESCRIPTION
service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working
directory set to /.
The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT. The supported values of COMMAND depend on the
invoked script, service passes COMMAND and OPTIONS it to the init script unmodified. All scripts should support at least the start and
stop commands. As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the start
command.
service --status-all runs all init scripts, in alphabetical order, with the status command.
If the init script file does not exist, the script tries to use legacy actions. If there is no suitable legacy action found and COMMAND is
one of actions specified in LSB Core Specification, input is redirected to the systemctl. Otherwise the command fails with return code 2.
FILES
/etc/init.d
The directory containing System V init scripts.
ENVIRONMENT
LANG, TERM
The only environment variables passed to the init scripts.
SEE ALSO chkconfig(8), ntsysv(8), systemd(1), systemctl(8), systemd.service(5)
Jan 2006 service(8)