Question

Script which executes commands in infinite loop in background

<SOMETHING ELSE AT START OF SCRIPT>

cmd='while true;
do
    ps aux | head;
    sleep 1;
done > $FILE'    

ssh root@$SERVER $cmd &
...
...
<SOME OTHER TASKS>
...
...
( at the end of this script, how to kill the above snippet executing in remote server)
[ kindly note i dont want to wait as the while loop is infinite ]

Read and tried some posts from stackoverflow, but could not find exact solution for this problem.

Answer 1

Rather than an infinite loop, use a sentinel file:

cmd='while [ -r /tmp/somefile];
do
  # stuff
done > $FILE'

ssh root@$SERVER touch /tmp/somefile
ssh root@$SERVER $cmd &
# do other stuff
ssh root@$SERVER rm -f /tmp/somefile

This follows your current practice of putting the remote command in a variable, but the arguments against that cited elsewhere should be considered.