From owner-freebsd-questions@freebsd.org Fri Oct 16 13:23:45 2020 Return-Path: Delivered-To: freebsd-questions@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id E0B0C435C9F for ; Fri, 16 Oct 2020 13:23:45 +0000 (UTC) (envelope-from freebsd@edvax.de) Received: from mout.kundenserver.de (mout.kundenserver.de [212.227.17.10]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "mout.kundenserver.de", Issuer "TeleSec ServerPass Class 2 CA" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4CCRgN1r8Tz3Stl for ; Fri, 16 Oct 2020 13:23:43 +0000 (UTC) (envelope-from freebsd@edvax.de) Received: from r56.edvax.de ([94.222.3.6]) by mrelayeu.kundenserver.de (mreue108 [212.227.15.183]) with ESMTPA (Nemesis) id 1N3sVq-1kKZy715zE-00zjhU; Fri, 16 Oct 2020 15:23:39 +0200 Date: Fri, 16 Oct 2020 15:23:38 +0200 From: Polytropon To: Ralf Mardorf Cc: freebsd-questions@freebsd.org Subject: Re: sh scripting question Message-Id: <20201016152338.168831c5.freebsd@edvax.de> In-Reply-To: <20201016113408.16d58d68@archlinux> References: <20201016113408.16d58d68@archlinux> Reply-To: Polytropon Organization: EDVAX X-Mailer: Sylpheed 3.1.1 (GTK+ 2.24.5; i386-portbld-freebsd8.2) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K1:qUH1OHKaBhTjYZUVKNTa4QX71QCzBojpfWYtMbkWCl04NMl7yFD M1i/jURVIgu1UryrJ2KwnGeK/0GQPFmjRPmFXkwicK3n/YeWGLZRajMHoGQ89nKdCAJtTO8 6cYpZ2R0jddyeO1eseG+FByjqVILtamm5yxkgwseR2ft1bki0kDEXxIki22U/RiXaar6pO+ peRyu6USySHpwLgAGTLnA== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:D//Oc2klslQ=:EmeIPOclq7utEKfr6OBcRd kvX3QDzTrdfBbgXLFvYvlkaWbTzXs7KyrjYJoGKPQq1F70xRdJYv9Twt3L9r9pvv0Cyr9u84/ JV9c6wCPuL3N7SIHPSoxJ33UeoYInlY7iTSIbxdM7fvVFP/QSjN+EEBGO/6NjhZ5cK12ipmyY 58wbbWPC0025A2+aydOVVE2nclxtSd8phXygLaqaZ5KQIuu9m4N9TZ0UOrIKfB+CBsMGyABbt KTyp/SsWNl8YrAq15gblVV7h2K2irmKk22C3jSZhXdygsjZeDSIVaxv5AljPRT7482dKhDOfI XmlLrAM9gCSzn97iKpkjUOs6AwM2kYTbiF3at1ZVSq64a72xazyyg94uKHyV4Q99QHEse5aj3 JwWAdARmHtWGg3XE3X97rqLx86N8cq1ecGQ5RIEMkL374Jjag9opuv9pbWF06 X-Rspamd-Queue-Id: 4CCRgN1r8Tz3Stl X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=none (mx1.freebsd.org: domain of freebsd@edvax.de has no SPF policy when checking 212.227.17.10) smtp.mailfrom=freebsd@edvax.de X-Spamd-Result: default: False [-0.03 / 15.00]; HAS_REPLYTO(0.00)[freebsd@edvax.de]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; MV_CASE(0.50)[]; HAS_ORG_HEADER(0.00)[]; NEURAL_HAM_SHORT(-1.04)[-1.045]; RCPT_COUNT_TWO(0.00)[2]; RECEIVED_SPAMHAUS_PBL(0.00)[94.222.3.6:received]; RCVD_TLS_LAST(0.00)[]; R_DKIM_NA(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:8560, ipnet:212.227.0.0/16, country:DE]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.63)[-0.632]; REPLYTO_EQ_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_LONG(-0.75)[-0.751]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[edvax.de]; AUTH_NA(1.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; MID_CONTAINS_FROM(1.00)[]; RCVD_IN_DNSWL_NONE(0.00)[212.227.17.10:from]; R_SPF_NA(0.00)[no SPF record]; RWL_MAILSPIKE_POSSIBLE(0.00)[212.227.17.10:from]; RCVD_COUNT_TWO(0.00)[2]; MAILMAN_DEST(0.00)[freebsd-questions] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 16 Oct 2020 13:23:45 -0000 On Fri, 16 Oct 2020 11:34:08 +0200, Ralf Mardorf wrote: > Imagine a file named > > - > > or > > -h > > or > > --help > > etc., then add the file name behind a command. > > Yes, you could use a workaround, such as adding a path. > > [rocketmouse@archlinux tmp]$ cat --help | head -1 > Usage: cat [OPTION]... [FILE]... > [rocketmouse@archlinux tmp]$ cat ./--help | head -1 > test For such files, using "--", the "stop processing command line options" directive, is quite useful: # cat -- --help | head -l This of course assumes that _after_ the offending filename, no further command line arguments will be supplied. > However, you easily could end up with a script containing more lines > that workaround offended conventions, than containing lines for what > actually should be done. That's right, a "benevolent script" will eventually contain many different kinds of defensive mechanisms, and will therefore be much more complex (and surely prone to breaking, if not done properly) than a script working on "normalized" filenames. -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ...