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Re: bash doesn't run as a login when when -c specified
From: |
Chet Ramey |
Subject: |
Re: bash doesn't run as a login when when -c specified |
Date: |
Mon, 27 Jun 2011 22:31:55 -0400 |
User-agent: |
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.17) Gecko/20110414 Lightning/1.0b2 Thunderbird/3.1.10 |
On 6/27/11 11:28 AM, Todd.Miller@courtesan.com wrote:
> Machine Type: x86_64-unknown-openbsd4.9
>
> Bash Version: 4.2
> Patch Level: 10
> Release Status: release
>
> Description:
> Newer versions of bash appear to ignore the '-' in argv[0]
> when the "-c" option is specified. That is, for:
> char *argv[] = { "-bash", "-c", "id", NULL };
> bash used to run as a login shell and source .bash_profile.
> I've verified that bash 3.00.15 behaves as expected but
> bash 3.2 and 4.2 require that the "-l" option be specified
> even though argv[0] indicates that it should be a login
> shell. Is this change in historical behavior intentional?
Yes. It's a compile-time option (NON_INTERACTIVE_LOGIN_SHELLS, which is
off by default) and has been that way for almost 15 years. The change
log says that option was added before bash-2.02; the code is the same in
bash-3.0. The thinking was that allowing non-interactive login shells
that sourced startup files intended to be run when interactive (e.g.,
.bash_profile) caused more harm than good, and that non-interactive
shells shouldn't be running any startup files in general.
> All other Borne-type shells I've tried have the historical
> behavior.
Bash behaves that way when run in Posix mode.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/