From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eric Abrahamsen Newsgroups: gmane.emacs.help Subject: Re: reading from standard input in batch mode Date: Tue, 22 May 2018 13:44:37 -0700 Message-ID: <874lizzah6.fsf@ericabrahamsen.net> References: <87efi3zbrb.fsf@ericabrahamsen.net> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1527021975 31736 195.159.176.226 (22 May 2018 20:46:15 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 22 May 2018 20:46:15 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Tue May 22 22:46:11 2018 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fLEAc-000880-Hq for geh-help-gnu-emacs@m.gmane.org; Tue, 22 May 2018 22:46:10 +0200 Original-Received: from localhost ([::1]:57849 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fLECj-0006XS-MN for geh-help-gnu-emacs@m.gmane.org; Tue, 22 May 2018 16:48:21 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:53923) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fLEC3-0006Wk-Dn for help-gnu-emacs@gnu.org; Tue, 22 May 2018 16:47:44 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fLEBy-0007Vy-FG for help-gnu-emacs@gnu.org; Tue, 22 May 2018 16:47:39 -0400 Original-Received: from [195.159.176.226] (port=45920 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fLEBy-0007Vh-7t for help-gnu-emacs@gnu.org; Tue, 22 May 2018 16:47:34 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1fLE9o-0007Er-S8 for help-gnu-emacs@gnu.org; Tue, 22 May 2018 22:45:20 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 26 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:LITugOA3tgAA1iMBd4fqzAanVF0= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.159.176.226 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.org gmane.emacs.help:116814 Archived-At: Eric Abrahamsen writes: > I'm trying to figure out how batch mode works, and I want to do > something very simple: call a subordinate emacs process, passing it a > string, and have it write the string to a file. It's not working but I > don't know how to debug this. > > In boomerang.el: > > (defun boomerang () > (let ((msg (read))) > (append-to-file msg > nil > "/home/eric/tmp/results.txt"))) > > In my main emacs: > > (shell-command > "emacs -Q --batch -l boomerang.el -f boomerang \"hi there\"") > > The subordinate emacs starts and finishes (returning 255, which just > came up on a thread in emacs.devel, I think), but no file is written. As > far as I know, `read' should be reading from standard-input in this > case. What am I doing wrong? I figured it out, it should have been (read t). Ignore me!