SSH Process monitoring and Exit Status evaluation

Shell Programming and Scripting
1

Hi All,
I have a peculiar requirement as follows,
I have a some hosts on which i have to run a script, so i am using the following code piece

for i in $HOSTLIST
do
  ssh ${i} "~/task.sh"
done

Now i want to run this same thing in parallel on all the hosts and then monitor the ssh process and also get the appropriate process exit status and i want to log the same so i tried the following

for i in $HOSTLIST
do
  ssh ${i} "~/task.sh"
  echo "${i}:$!" > process.file
done
 
for line in `cat process.file`
do
   #Assuming i have extracted pid value using cut
   pid=`echo ${line}|cut -d ":" -f2`
   wait "${pid}"
   echo "$? - Status for ${pid}" > Status.file 
done

The error i am getting now i sthe status is alwaus logged as 127 and the log shows
wait: pid <PID> is not a child of this shell

Also the ssh script is run in flow as follows
1.sh -> 2.sh ->3.sh(script which has ssh code in it)

Any help on this will be highly appreciated...

TIA

---------- Post updated at 02:52 PM ---------- Previous update was at 02:33 PM ----------

Anyone has any idea about it?

2

I highly recommend the pdsh tools which greatly facilitates this kind of thing. I really think this will solve most of your problems.

Anyway, the main problem is that you are not putting the processes into the background.

Which shell are you using? Is it bash? if so, which version?

1 Like