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From: gwyn@brl-tgr.ARPA (Doug Gwyn )
Newsgroups: net.bugs.4bsd,net.unix-wizards
Subject: Re: sh -c 'trap "" 10; date' vs. sh -c 'trap "" 11; date' on 4.?bsd
Message-ID: <4623@brl-tgr.ARPA>
Date: Fri, 14-Sep-84 16:06:52 EDT
Article-I.D.: brl-tgr.4623
Posted: Fri Sep 14 16:06:52 1984
Date-Received: Tue, 25-Sep-84 02:38:07 EDT
References: <1207@elsie.UUCP>
Organization: Ballistics Research Lab
Lines: 4

Yes, you cannot catch trap 11 in the Bourne shell since it is needed
internally for memory allocation purposes.  Newer shells give the
following message on your example:
	sh: bad trap: cannot trap 11