commands after nohup jobs finish

ip_address · 03-25-2013, 06:40 PM

Hello everyone,

I am running multiple nohup jobs from a shell script and want to run other commands after all of these nohup jobs are finished. How can I do that? Thanks!

Code:

num_lines=$(wc -l < "$FILE");

for ((counter=1;counter<="$num_lines";counter++));do

	col_name=$(sed -n "$counter"p "$FILE" | awk -F":" '{print $2}');
	echo "#!/bin/bash" >> "$col_name".sh;
        #contents is a file in the same directory that contains the logic
	cat contents >> "$col_name".sh;
	chmod +x "$col_name".sh;
	nohup "$col_name".sh > log_"$col_name" &

done

#Now I want to wait till all the nohup jobs are completed and then use some commands on the output files generated by each "$col_name".sh.

suicidaleggroll · 03-25-2013, 06:58 PM

Never tried it with nohup, but you can wait on background processes with the "wait" command, eg:

Code:

#!/bin/bash

./code args &

# do stuff while "code" is running

wait %1

# do stuff after "code" has finished

ip_address · 03-26-2013, 05:31 PM

wait %1 does not work with nohup. I submitted couple of jobs using nohup but before all of them were finished main script started processing next commands even though I used wait %1. any other alternatives?

ntubski · 03-26-2013, 07:23 PM

Just run wait without %1:

Code:

nohup cmd &

# wait for every child process to finish
wait

Ramurd · 03-28-2013, 08:36 AM

What about storing stuff in an array with the PID?

Code:

nohup command &
NOHUPS[${#NOHUPS]=$!
nohup command2 &
NOHUPS[${#NOHUPS]=$!

Then send kill -0 to all those PIDs to see if they're still alive (or not) and continue when all of them have finished...

suicidaleggroll · 03-28-2013, 09:44 AM

Quote:

Originally Posted by ip_address

wait %1 does not work with nohup. I submitted couple of jobs using nohup but before all of them were finished main script started processing next commands even though I used wait %1. any other alternatives?

If you're going to wait for the jobs to finish before continuing on with the script anyway, then why do you need nohup?