From owner-freebsd-questions@freebsd.org Sat Mar 6 05:15:39 2021 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 B6436575CAC for ; Sat, 6 Mar 2021 05:15:39 +0000 (UTC) (envelope-from kevans@freebsd.org) Received: from smtp.freebsd.org (smtp.freebsd.org [IPv6:2610:1c1:1:606c::24b:4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "smtp.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Dst974StDz4mbQ; Sat, 6 Mar 2021 05:15:39 +0000 (UTC) (envelope-from kevans@freebsd.org) Received: from mail-qk1-f182.google.com (mail-qk1-f182.google.com [209.85.222.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) (Authenticated sender: kevans) by smtp.freebsd.org (Postfix) with ESMTPSA id 83ACDF8F6; Sat, 6 Mar 2021 05:15:39 +0000 (UTC) (envelope-from kevans@freebsd.org) Received: by mail-qk1-f182.google.com with SMTP id 130so4244547qkh.11; Fri, 05 Mar 2021 21:15:39 -0800 (PST) X-Gm-Message-State: AOAM532riZVL8nSOMdyS6wt7Ir6LVGDs5i7FHumMOnKJinzf36ACLrgo PJXMgSqgeiaOsleci6lw6OstzAIXzkPQ0BFvm7Y= X-Google-Smtp-Source: ABdhPJxEQLyjdrAX9YJzGoHwinyda9rcdG3+xM5oGTV/GXMorPD/ap5T0xv52ElaxncZr0kvT9Fr3jtpPMyUQcQ6aPc= X-Received: by 2002:a37:988:: with SMTP id 130mr13186457qkj.120.1615007738799; Fri, 05 Mar 2021 21:15:38 -0800 (PST) MIME-Version: 1.0 References: <9178f6c5-631a-c2c2-c6b1-8def94a3397b@dreamchaser.org> In-Reply-To: From: Kyle Evans Date: Fri, 5 Mar 2021 23:15:27 -0600 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: sed -i empty argument compatibility issue To: freebsd@dreamchaser.org Cc: Kyle Evans , FreeBSD Mailing List Content-Type: text/plain; charset="UTF-8" X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 06 Mar 2021 05:15:39 -0000 On Fri, Mar 5, 2021 at 11:12 PM Gary Aitken wrote: > > On 3/5/21 9:39 PM, Kyle Evans wrote: > > On Fri, Mar 5, 2021 at 3:03 PM Gary Aitken wrote: > >> > >> I'm trying to come up with a fix for a script in a port which invokes sed. > >> The port comes from a linux environment, and the offending line looks like this: > >> (This is in a cMake file.) > >> > >> COMMAND sed -i "/^# /d" "${outfile}" > >> > >> The issue is that linux sed expects the -I or -i extension modifier to > >> immediately follow the -i. In the above line, the extension is deliberately > >> missing to provide in-place editing. > >> > >> fbsd expects the extension to be separated from the -i by whitespace, or > >> doesn't work properly when it is empty or immediately follows the -i: > >> > >> $ !ls > >> ls -lt temp.tmp* > >> -rw------- 1 garya garya 86 Mar 5 13:15 temp.tmp > >> -rw------- 1 garya garya 86 Mar 5 13:15 temp.tmp_org > >> $ sed -ifoo "/^# /d" temp.tmp (works on both fbsd & linux)) > >> $ !ls > >> ls -lt temp.tmp* > >> -rw------- 1 garya garya 30 Mar 5 13:48 temp.tmp > >> -rw------- 1 garya garya 86 Mar 5 13:15 temp.tmp_org > >> -rw------- 1 garya garya 86 Mar 5 13:15 temp.tmpfoo > >> $ cp -p temp.tmp_org temp.tmp > >> $ sed -i"" "/^# /d" temp.tmp (works on linux but not fbsd) > >> sed: 1: "temp.tmp": undefined label 'emp.tmp' > >> $ sed -i "" "/^# /d" temp.tmp (works on fbsd but not linux) > >> $ !ls > >> ls -lt temp.tmp* > >> -rw------- 1 garya garya 30 Mar 5 13:49 temp.tmp > >> -rw------- 1 garya garya 86 Mar 5 13:15 temp.tmp_org > >> -rw------- 1 garya garya 86 Mar 5 13:15 temp.tmpfoo > >> > >> So fbsd works with '-i ""' but linux requires '-i""' > >> > >> Does anyone know a work-around for this problem? > >> > > > > My personal favorite trick to bridge the gap here was, as I recall: > > > > sed -i'' '' 's/../.../' ${file} > > > > IIRC those sed's with an optional backup suffix (Linux, OpenBSD) will > > accept the immediately following empty string and accept the next > > empty word as an empty command, while our getopt will effectively > > ignore the rest of the -i word and use the following optarg as usual. > > Unfortunately, times appear to have changed, at least on ubuntu-18.04: > > $ sed -i'' '' "/^# /d" temp.tmp > sed: can't read /^# /d: No such file or directory > Oh, sorry. Try slapping with an -e: $ sed -i'' '' -e "/^# /d" temp.tmp