Path: utzoo!mnetor!uunet!mcvax!ukc!its63b!aiva!richard
From: richard@aiva.ed.ac.uk (Richard Tobin)
Newsgroups: comp.unix.questions
Subject: Re: Weird things in csh (and kernel?)
Message-ID: <275@aiva.ed.ac.uk>
Date: 3 Mar 88 14:25:08 GMT
References: <1193@ark.cs.vu.nl> <662@sjoerd.cs.vu.nl> <1195@ark.cs.vu.nl> <7368@brl-smoke.ARPA> <1198@ark.cs.vu.nl>
Reply-To: richard@uk.ac.ed.aiva (Richard Tobin)
Organization: Bannerman's Bar, Cowgate, Edinburgh
Lines: 16
Keywords: csh, script

In article <1198@ark.cs.vu.nl> maart@cs.vu.nl (Maarten Litmaath) writes:
   [discussion of which shell csh uses to run a script]

Csh [BSD 4.2] assumes that it should run /bin/sh if and only if
(1) exec() fails with ENOEXEC
(2) there isn't an alias for shell
(3) it can read the first character of the file
(4) that character isn't '#'

Thus empty files get run with csh, because (3) is violated.

-- Richard
-- 
Richard Tobin,                         JANET: R.Tobin@uk.ac.ed             
AI Applications Institute,             ARPA:  R.Tobin%uk.ac.ed@nss.cs.ucl.ac.uk
Edinburgh University.                  UUCP:  ...!ukc!ed.ac.uk!R.Tobin