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Well, it looks like the ps is picking up the process ID ($$) of your script when it gets to 'M02' (whatever that it), and killing it.

Perhaps you could add "| grep -v $$" to your command, to...

How do you know that the second argument of the script is not the same as the second column returned by ps?

What is the value of $2 (the argument to the script) and what is the output of the ps...