From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Thu, 9 Oct 2003 19:36:09 +0400 From: Alexey Tourbin To: devel@altlinux.ru Message-ID: <20031009153609.GH1726@julia.office.altlinux.ru> Mail-Followup-To: devel@altlinux.ru References: <20031008143909.GU1726@julia.office.altlinux.ru> <20031008181830.W22705@elefant.dgtu.donetsk.ua> <20031008152357.GX1726@julia.office.altlinux.ru> <20031008223440.208a70e0.dav@altlinux.ru> <20031009100204.GZ1726@julia.office.altlinux.ru> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="+/c+wG9PuVDVAlsu" Content-Disposition: inline In-Reply-To: <20031009100204.GZ1726@julia.office.altlinux.ru> Subject: [devel] Re: bash vs sh policy X-BeenThere: devel@altlinux.ru X-Mailman-Version: 2.1.2 Precedence: list Reply-To: ALT Devel discussion list List-Id: ALT Devel discussion list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 09 Oct 2003 15:37:07 -0000 Archived-At: List-Archive: List-Post: --+/c+wG9PuVDVAlsu Content-Type: text/plain; charset=koi8-r Content-Disposition: inline Content-Transfer-Encoding: 8bit On Thu, Oct 09, 2003 at 02:02:04PM +0400, Alexey Tourbin wrote: > Some more modern operating systems talk about `the POSIX shell'. > This is an attempt to standardize UNIX shells; it's most like > the Korn shell, although, a bit confusingly, it's often just > called sh, because the standard says that it should be. > Usually, this just means you get a bit extra free with your sh > and it still does what you expect. Интересно. Google показывает, что на самом деле всё ещё сложнее: Also on Digital Unix you may way to use /usr/bin/posix/sh rather than the DEC special bourne shell. Alternatively (from the man page): [Digital] Subsequent shells spawned from the initial shell depend on the value in the environment variable BIN_SH. If this variable is set to xpg4, the POSIX shell is started. If this variable is set to svr4, an SVR4 compliant version of the shell is started. If this variable is unset, the Bourne shell is started. If this variable is set to any other value, an error is reported and the results are unpredicatable. http://www.greatcircle.com/lists/majordomo-workers/mhonarc/majordomo-workers.199610/msg00159.html If you graft on some interactive productivity enhancements onto the Bourne shell, the result is the POSIX (Portable Operating System Interface) shell. The POSIX shell is very similar to the Korn shell in terms of the interactive features provided, right down to the keystroke in most cases. The Korn shell is not standardized, so there are annoying differences between various vendor's versions; the POSIX shell attempts to raise the bar for a universally available shell. The current POSIX shells are based on POSIX.2 of the IEEE POSIX Shell and Tools specification (IEEE Working Group 1003.2). The POSIX shell is a superset of the Bourne shell. ... The POSIX shell offers many shortcuts, such as aliases, cd path searches, filename completion and job control. http://216.239.59.104/search?q=cache:xXuCYqFChlsJ:www.unix.kg/eng/misc/unix_unleashed/page014.shtml+posix+shell+sh5 Короче SystemV shell (aka sh5) != Bourne shell != POSIX shell != Bash. --+/c+wG9PuVDVAlsu Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQE/hYBpfBKgtDjnu0YRAs1UAJwMdC/kkraYV7NSi5/Hy/SN1hwc7ACfdFgv FdNTAiJQa0VGeNnro9GjhnQ= =U/Cz -----END PGP SIGNATURE----- --+/c+wG9PuVDVAlsu--