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: reading from standard input in batch mode Date: Tue, 22 May 2018 13:16:56 -0700 Message-ID: <87efi3zbrb.fsf@ericabrahamsen.net> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1527020303 7297 195.159.176.226 (22 May 2018 20:18:23 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 22 May 2018 20:18:23 +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 22:18:19 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 1fLDje-0001o8-QU for geh-help-gnu-emacs@m.gmane.org; Tue, 22 May 2018 22:18:18 +0200 Original-Received: from localhost ([::1]:57756 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fLDll-00073w-Tn for geh-help-gnu-emacs@m.gmane.org; Tue, 22 May 2018 16:20:29 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:48211) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fLDlJ-00073e-QN for help-gnu-emacs@gnu.org; Tue, 22 May 2018 16:20:02 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fLDlE-0005cb-SO for help-gnu-emacs@gnu.org; Tue, 22 May 2018 16:20:01 -0400 Original-Received: from [195.159.176.226] (port=60897 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fLDlE-0005ZN-Ko for help-gnu-emacs@gnu.org; Tue, 22 May 2018 16:19:56 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1fLDj2-000166-Gj for help-gnu-emacs@gnu.org; Tue, 22 May 2018 22:17:40 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 25 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:w8hixPjuBGRipzWrLlascJepwB8= 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:116813 Archived-At: 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? Thanks, Eric