Stephane Chazelas wrote:
On Tue, Oct 10, 2006 at 06:14:22PM -0500, mwoehlke wrote:
[...]
$ zsh -c 'echo "`/dev/null 2>&1`"' bash
bash: /dev/null: Permission denied
$ zsh
$ ARGV0=bash ash -c 'echo "`/dev/null 2>&1`"; echo $BASH'
bash: /dev/null: Permission denied
Eh? I get:
$ zsh -c 'echo "`/dev/null 2>&1`"' bash
zsh:1: permission denied: /dev/null
Well, I do get what I said with zsh 4.3.2
$ ARGV0=bash ash -c 'echo "`/dev/null 2>&1`"; echo $BASH'
/dev/null: permission denied
(note that this command must be run from zsh which uses
ARGV0=... to set ash's argv[0]).
You must have an older /ash/ than I have mine is one of the
OpenBSD based sh ones (found on debian).
Maybe, I never use ash or zsh (intentionally, anyway; IIRC Cygwin uses
ash under the covers some time, but I never use either interactively),
so I just got whatever versions came with the system (FC4). I don't
doubt that you can make these work, I'm just noting that ability/method
of circumventing the aforementioned test is inconsistent. :-)
So neither of your counter-examples is working for me (although both
look like they *should*; go figure).
Though I'd bet the third one with .zshenv worked.
But since you didn't counter
BASH_SUBSHELL (and since I'm too lazy to change it now) I guess I'll
stick with that. :-)
BASH_SUBSHELL is a relatively recent addition to bash. Most
systems still don't have a bash3.
$ bash -c 'echo "$BASH_VERSION, <$BASH_SUBSHELL>"'
2.05b.0(2)-release, <>
Ah, well, I have 3.1.17 builds available for 9 of 10 systems these
scripts may need to run on (plus two others) and the tenth has 3.1.0.
I'm not particularly concerned if I'm only catching 3.0+ versions, since
that will also insulate me from anything else that is 3.0+-specific
(i.e. it's OK if I use new features because I've ensured that I have
them). Thanks for pointing this out, though.
--
Matthew
Will your shell have salvation? Only if it's Bourne Again.
_______________________________________________
Bug-bash mailing list
Bug-bash@gnu.org
http://lists.gnu.org/mailman/listinfo/bug-bash
