So, should I send-pr?
-mi
Rahul Dhesi once stated:
=Many years ago I posted a shell script to Usenet in which I prepended a
=line with 'exec', in an attempt to avoid having a shell process hanging
=around doing a wait(). David Korn himself (of Korn shell fame)
=responded saying this was not necessary, as the shell would do exec()
=anyway.
=
=I check with trace() on a Sun and he seemed to be right. This was for
=the classic Bourne shell many years ago.
=
=But I just checked /bin/sh on 3.1-RELEASE with ktrace and the above does
=not seem to be true. I get drastically different traces for
=
= #! /bin/sh
= exec /bin/pwd
=
=and
=
= #! /bin/sh
= /bin/pwd
=
=Rahul
=
=> Date: Fri, 19 Feb 99 11:43:59 EST
=> From: Mikhail Teterin <m...@misha.cisco.com>
=> To: curr...@freebsd.org
=> Message-Id: <199902191644.laa08...@misha.cisco.com>
=> Subject: sh(1) -- exec vs. fork
=> Reply-To: m...@aldan.algebra.com
=
=> I just finished going through a couple of crontabs prepending the
=> command-lines with ``exec'', when it hit me.
=>
=> Can shell itself recognize, there will be no more commands and just
=> proceed to exec without forking? What would this break?
=...
=
=
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