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From: ron@BRL.ARPA (Ron Natalie)
Newsgroups: net.unix-wizards
Subject: Re:  su in crontab
Message-ID: <1637@brl-tgr.ARPA>
Date: Wed, 15-Jan-86 20:15:42 EST
Article-I.D.: brl-tgr.1637
Posted: Wed Jan 15 20:15:42 1986
Date-Received: Fri, 17-Jan-86 06:25:50 EST
Sender: news@brl-tgr.ARPA
Lines: 5

The reason is that su changes both the real and the effective UIDs
via a setuid system call.  It accomplishes this as it was effectively
root at invocation due it being a setuid file.

-Ron