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From: Ralf Damaschke <rwspam@gmx.de>
Newsgroups: comp.unix.shell
Subject: Re: a sed question
Date: 20 Dec 2024 00:55:04 GMT
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Salvador Mirzo wrote:

> Ralf Damaschke <rwspam@gmx.de> writes:
>> The specification in https://pubs.opengroup.org/onlinepubs/9799919799/
> 
> That's the home page.  I believe you meant to link the sed page
> directly.  When copying URLs from the specification, we need to copy the
> framed URL, otherwise we always end up at the home page.  The framed sed
> page is at
> 
>   https://pubs.opengroup.org/onlinepubs/9799919799/utilities/sed.html

Actually I considered that. But I felt that the top page might be of more
value since it is easy to find "Shell & Utilities" and "Utilities" in the
frames at the left, whereas the HOME link at the subframe leads to a very
detailed table of content where I would have to use the browser's find
command to locate the specs of other commands.

> I tried to change a line and then append another.  In both
> FreeBSD's and GNU's sed, I the append takes place (and I thought they
> would not if they were to obey the specification).

> $ sed '/^x/{c\
> hello a\
> hi }' x.txt a line hello hi more lines more lines $
> $ sed '/^x/{c\
> hello
> a\
> hi
> }' x.txt

For GNU sed that might be a version issue.
On my system with sed version "sed (GNU sed) 4.9" the copied&pasted
command only prints "hello" for "x" and ignores the append command.