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	Thu, 1 May 1997 15:45:41 +0100 (BST)
To: chet@po.cwru.edu
Cc: hackers@freebsd.org
Subject: Re: /bin/sh -c and ENV
References: <9705011332.AA06946.SM@odin.INS.CWRU.Edu>
From: Andrew Gierth <andrew@erlenstar.demon.co.uk>
In-Reply-To: Chet Ramey's message of Thu, 1 May 1997 09:32:30 -0400
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Date: 01 May 1997 15:45:41 +0100
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>>>>> "Chet" == Chet Ramey <chet@odin.ins.cwru.edu> writes:

 Chet> It's a bug.  A post-publication POSIX.2 interpretation made it clear
 Chet> that ENV should be executed only for interactive shells.

Should ENV be disabled for *all* non-interactive shells, or only for -c?

I ask, because I just confirmed the results I recalled from testing this
on HP-UX 10.10 (the first Unix flavour I encountered where /bin/sh was 
a Posix shell rather than a Bourne shell), and on that version at least,
if you do "sh scriptname" (or invoke a #!-type script) then it still
sources the ENV file.

Basically, given the following script:

---8<--------
#!/bin/sh

[ -z "$1" ] || { echo "Recursive test completed"; exit 0; }

ENV=$HOME/env_test
export ENV
echo "echo ENV was executed" >$ENV

echo "Testing -c:"
/bin/sh -c "echo Test completed"

echo "Testing sh scriptname"
/bin/sh $0 recurse

echo "Testing #!"
$0 recurse

exit
---8<--------

the output on FreeBSD is:

/u/andrew $ ./foo
Testing -c:
ENV was executed
Test completed
Testing sh scriptname
ENV was executed
Recursive test completed
Testing #!
ENV was executed
Recursive test completed
/u/andrew $

whereas the output on HP-UX 10.10 is:

/u/andrew $ ./foo
Testing -c:
Test completed
Testing sh scriptname
ENV was executed
Recursive test completed
Testing #!
ENV was executed
Recursive test completed
/u/andrew $

Now I'm quite prepared to believe that these are *both* wrong in some
respect, but I'd like to know what the intended *correct* behaviour is.

-- 
Andrew.

(FAQ-maintainer for comp.unix.programmer)