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Shell Programming and Scripting

Execute a C program from Shell

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Top Forums Shell Programming and Scripting Execute a C program from Shell
# 15  
Old 12-21-2010
./program &
wait
PID=$!
This is working but when i use
echo $PID
I get two numbers
# 16  
Old 12-21-2010
Quote:
Originally Posted by rmoncello
The "wait" will halt script execution until the program completes. Just placing it in the background via the "&" will allow the script to continue. The bash "$!" environemt variable will return the process ID of the last command put in the background. No sleep. No wait. Simply execute in background and capture PID via the $! then proceed with what you need to do with the script.
I already mentioned this $! in post #8.

I have no idea why the O/P wants his script to sleep for 2 minutes and I'm not going to second guess it.

---------- Post updated at 06:49 PM ---------- Previous update was at 06:48 PM ----------

Quote:
Originally Posted by nteath
./program &
wait
PID=$!
This is working but when i use
echo $PID
I get two numbers
That hardly seems likely. $! stores the process ID of the last background job run.
# 17  
Old 12-21-2010
Quote:
Originally Posted by scottn
I already mentioned this $! in post #8.

I have no idea why the O/P wants his script to sleep for 2 minutes and I'm not going to second guess it.

---------- Post updated at 06:49 PM ---------- Previous update was at 06:48 PM ----------



That hardly seems likely. $! stores the process ID of the last background job run.
Hi Scott!

I realize you first mentioned that in #8. I had been typing up #11 while you submitted that. The sleep was introduced by someone else in #2 where they were attempting to use a ps and grep pipe to get the PID. I don't believe that O/P really wants a sleep in there.
# 18  
Old 12-21-2010
Quote:
Originally Posted by rmoncello
Hi Scott!

I realize you first mentioned that in #8. I had been typing up #11 while you submitted that. The sleep was introduced by someone else in #2 where they were attempting to use a ps and grep pipe to get the PID. I don't believe that O/P really wants a sleep in there.
You're right. Sorry, I missed that.

So maybe the OP doesn't want to sleep. I do Smilie

O/P: Read posts 8 and 11, and ignore everything else! (no disrespect to anurag.singh)

Perhaps knowing what you want to do with the PID once you have it might be more useful to know.
This User Gave Thanks to Scott For This Post:
nteath
# 19  
Old 12-21-2010
Ok after all i got my pid with: PID=$!
Thank you Smilie

---------- Post updated at 01:51 PM ---------- Previous update was at 12:55 PM ----------

I have another question ( not sure if i had to make a new thread)

Now that i have the PID i want to retrieve information about my process, using the command 'top'.

So far i have
top -b -d 1.0 -p $PID
which returns information while my process is running. When the process stops , top is still running. How can i stop it and proceed with my shell?
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