Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261433AbVECROT (ORCPT ); Tue, 3 May 2005 13:14:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261419AbVECROT (ORCPT ); Tue, 3 May 2005 13:14:19 -0400 Received: from neapel230.server4you.de ([217.172.187.230]:13486 "EHLO neapel230.server4you.de") by vger.kernel.org with ESMTP id S261399AbVECROM (ORCPT ); Tue, 3 May 2005 13:14:12 -0400 Message-ID: <4277B15F.1020102@lsrfire.ath.cx> Date: Tue, 03 May 2005 19:14:07 +0200 From: Rene Scharfe User-Agent: Mozilla Thunderbird 1.0.2 (Windows/20050317) X-Accept-Language: de-DE, de, en-us, en MIME-Version: 1.0 To: Bill Davidsen Cc: Matt Mackall , "Bodo Eggert " <7eggert@gmx.de>, Linus Torvalds , Ryan Anderson , Andrea Arcangeli , linux-kernel , git@vger.kernel.org Subject: Re: Mercurial 0.4b vs git patchbomb benchmark References: <20050503012921.GD22038@waste.org> <4277A52E.1020601@tmr.com> In-Reply-To: <4277A52E.1020601@tmr.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1210 Lines: 34 Bill Davidsen schrieb: > On the theory that my first post got lost, why use /usr/bin/env at > all, when bash already does that substitution? To support people who > use other shells? > > ie.: FOO=xx perl -e '$a=$ENV{FOO}; print "$a\n"' /usr/bin/env is used in scripts in the shebang line (the very first line of the script, starting with "#!", which denotes the interpreter to use for that script) to make a PATH search for the real interpreter. Some folks keep their python (or Perl, or Bash etc.) in /usr/local/bin or in $HOME, that's why this construct is needed at all. Changing environment variables is not the goal, insofar this usage exploits only a side-effect of env. It is portable in practice because env is in /usr/bin on most modern systems. So you could replace this first line of a bash script: #!/usr/bin/env python with this: #!python except that the latter doesn't work because you need to specify an absolute path there. :] Rene - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/