From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: util-linux-owner@vger.kernel.org Received: from plane.gmane.org ([80.91.229.3]:57793 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754922AbaC0Ski (ORCPT ); Thu, 27 Mar 2014 14:40:38 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1WTFEB-0005Zw-PV for util-linux@vger.kernel.org; Thu, 27 Mar 2014 19:40:35 +0100 Received: from 78-60-211-195.static.zebra.lt ([78.60.211.195]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 27 Mar 2014 19:40:35 +0100 Received: from grawity by 78-60-211-195.static.zebra.lt with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 27 Mar 2014 19:40:35 +0100 To: util-linux@vger.kernel.org From: =?UTF-8?B?TWFudGFzIE1pa3VsxJduYXM=?= Subject: Re: tty swtch key Date: Thu, 27 Mar 2014 20:40:22 +0200 Message-ID: References: <533320C5.7040609@ubuntu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 In-Reply-To: <533320C5.7040609@ubuntu.com> Sender: util-linux-owner@vger.kernel.org List-ID: On 2014-03-26 20:47, Phillip Susi wrote: > I could have sworn that I used the tty swtch feature once many years > ago and that it sent a special signal to the shell, causing it to be > suspended and return you to the parent shell, as if you had entered > the suspend command. I can't find the signal in the man pages now, > and using stty to set a swtch key and hitting it does nothing. Is > this unimplemented on linux, and if so, shouldn't the man page be > updated to reflect that? AFAIK, Linux never had this feature built-in. I'm not quite old enough to have actually used it, but I've read and saved a few Usenet posts that say `shl` ("shell layers") only existed in very old Unix versions like SVR3, to compete with BSD-style job control. (Looks like Google Groups removed find-by-Message-ID, unfortunately. I guess I could just attach all of the posts...) On the other hand, there _is_ a reimplementation of shl for Linux and Solaris, as part of heirloom-toolchest and . -- Mantas Mikulėnas