Date: Sat, 6 Mar 2021 05:53:13 -0500 From: Steven Friedrich <FreeBSD@TWC.com> To: freebsd-questions@freebsd.org Subject: Re: sed -i empty argument compatibility issue Message-ID: <bf0f8fe6-66c5-43a8-740a-5423ada4dd56@TWC.com> In-Reply-To: <9178f6c5-631a-c2c2-c6b1-8def94a3397b@dreamchaser.org> References: <9178f6c5-631a-c2c2-c6b1-8def94a3397b@dreamchaser.org>
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On 3/5/2021 3:58 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?
>
> Gary
Yes, the correct "work-around" is to FIX Linux. Linux is supposed to
mimic Unix, FreeBSD IS Unix.
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