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:D

What he meant was he wants his script to determine if it running via cron so that it can take different actions. For example an interactive script might give a progress report and request...

How often have you looked for multiple cron processes? Would you notice a second cron if you simply ran a "ps -ef" but were looking for something else? I can't speak to AIX since I've never worked...

There can be a lot of processes named cron. You are picking one at random and attempting to see if it's your parent. In your crontab entry do something that you won't do interactively. Like:
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