Date: Fri, 5 Mar 2021 13:58:03 -0700 From: Gary Aitken <freebsd@dreamchaser.org> To: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: sed -i empty argument compatibility issue Message-ID: <9178f6c5-631a-c2c2-c6b1-8def94a3397b@dreamchaser.org>
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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
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