Date: Thu, 27 Oct 2016 23:48:29 -0400 From: Anton Yuzhaninov <citrin+bsd@citrin.ru> To: freebsd-questions@freebsd.org Subject: Re: Interesting $0 Problem Message-ID: <5b07633f-3241-27a5-15fc-1c138a3083d8@citrin.ru> In-Reply-To: <2b1b598d-2ff1-2fa4-03d1-4771aa6f9c4d@tundraware.com> References: <b859f7a3-51d1-06f4-e793-332edd212068@tundraware.com> <20161028014923.GA11638@fedora24> <a6931603-c2b2-1dc7-6997-ae896db90d88@tundraware.com> <5812B617.5070701@gmail.com> <27078.128.135.52.6.1477621835.squirrel@cosmo.uchicago.edu> <20161028024041.GA93243@spectrum.skysmurf.nl> <2b1b598d-2ff1-2fa4-03d1-4771aa6f9c4d@tundraware.com>
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On 10/27/16 22:44, Tim Daneliuk wrote:
> I've used *BSD for decades and this is a new one to me. I've never seen
> this behavior anywhere else (like Linux). Do you have some sense of the
> rationale' for this?
It is very old Unix convention - argv[0] for login shells is prefixed by
"-".
From AT&T UNIX SRV2 (released in April, 1984):
file /src/cmd/login.c
char minusnam[16] = "-";
...
/* Generate the name of the shell with a '-' sign in front of it. */
/* This causes .profile processing when a shell is exec'ed. */
strcat(minusnam, namep);
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