NetBSD Problem Report #57483

From nabijaczleweli@nabijaczleweli.xyz  Fri Jun 23 14:17:01 2023
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Date: Fri, 23 Jun 2023 16:16:55 +0200
From: =?utf-8?B?0L3QsNCx?= <nabijaczleweli@nabijaczleweli.xyz>
Reply-To: =?utf-8?B?0L3QsNCx?= <nabijaczleweli@nabijaczleweli.xyz>
To: gnats-bugs@netbsd.org
Subject: tail -fn +20 and -fc +20 broken by legacy format
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>Number:         57483
>Category:       bin
>Synopsis:       tail -fn +20 and -fc +20 broken by legacy format
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jun 23 14:20:00 +0000 2023
>Last-Modified:  Fri Jun 23 17:05:01 +0000 2023
>Originator:     TODO
>Release:        NetBSD 9.2
>Environment:
System: NetBSD netbsd-dev 9.2 NetBSD 9.2 (GENERIC) #0: Wed May 12 13:15:55 UTC 2021 mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/i386/compile/GENERIC i386
Architecture: i386
Machine: i386
>Description:
Regardless of the inputs, tail -fc +20 and tail -fn +20 error
instantly with
  tail: illegal offset -- -n+20

This could have something to do with the undocumented "tail +20"
and "tail -20" legacy usages, but this breaks normal standard usage,
but tail -c +20 and tail -n +20 do work, so idk.

Best,

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>Fix:

Unknown
>Audit-Trail:
From: Valery Ushakov <uwe@stderr.spb.ru>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: bin/57483: tail -fn +20 and -fc +20 broken by legacy format
Date: Fri, 23 Jun 2023 20:00:15 +0300

 It's probably confused b/c -c is "hidden" by being fused into "-fc"
 and so obsolete() doesn't detect it.

 -uwe

>Unformatted:
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