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Re: Replace line in file based on pattern

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On Sun, Jan 02, 2022 at 06:20:15PM -0500, The Wanderer wrote:
> If you mean that you want to only replace the first matching line in the
> file, but leave any subsequent matching lines alone... I've never
> actually had occasion to do that, but a bit of Googling (for 'sed first
> match only') found me
> 
> https://stackoverflow.com/questions/148451/how-to-use-sed-to-replace-only-the-first-occurrence-in-a-file
> 
> which looks like at least the seed of a way to do it; see also below.

Why does everyone think sed is an appropriate tool for this?  It's
some sort of malevolent meme, I swear.

unicorn:~$ printf %s\\n foo foo foo | awk '!done && /foo/{$0="bar"; done=1} 1'
bar
foo
foo

Of course, given the ORIGINAL question, the best tool is neither of these.
It's something like ansible or puppet.  Or if you insist on jury-rigging
crap together with stone knives and bearskins, ssh and patch.

See also <http://backreference.org/2011/01/29/in-place-editing-of-files/>.

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Thread

Replace line in file based on pattern "Paul M. Foster" <paulf@quillandmouse.com> - 2022-01-03 00:10 +0100
  Re: Replace line in file based on pattern Andy Smith <andy@strugglers.net> - 2022-01-03 00:20 +0100
    Re: Replace line in file based on pattern "Paul M. Foster" <paulf@quillandmouse.com> - 2022-01-03 03:00 +0100
  Re: Replace line in file based on pattern The Wanderer <wanderer@fastmail.fm> - 2022-01-03 00:30 +0100
    Re: Replace line in file based on pattern Greg Wooledge <greg@wooledge.org> - 2022-01-03 00:50 +0100
      Re: Replace line in file based on pattern The Wanderer <wanderer@fastmail.fm> - 2022-01-03 02:20 +0100
        Re: Replace line in file based on pattern Greg Wooledge <greg@wooledge.org> - 2022-01-03 02:50 +0100
          Re: Replace line in file based on pattern "Paul M. Foster" <paulf@quillandmouse.com> - 2022-01-03 03:30 +0100
            Re: Replace line in file based on pattern Andrei POPESCU <andreimpopescu@gmail.com> - 2022-01-15 13:40 +0100
      Re: Replace line in file based on pattern "Paul M. Foster" <paulf@quillandmouse.com> - 2022-01-03 04:00 +0100
        Re: Replace line in file based on pattern Greg Wooledge <greg@wooledge.org> - 2022-01-03 05:10 +0100
          Re: Replace line in file based on pattern "Paul M. Foster" <paulf@quillandmouse.com> - 2022-01-03 14:40 +0100
            Re: Replace line in file based on pattern David Wright <deblis@lionunicorn.co.uk> - 2022-01-04 20:50 +0100
    Re: Replace line in file based on pattern "Paul M. Foster" <paulf@quillandmouse.com> - 2022-01-03 03:00 +0100
      Re: Replace line in file based on pattern john doe <johndoe65534@mail.com> - 2022-01-03 07:50 +0100

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