Date: Sat, 12 Apr 2014 21:36:25 GMT From: Volodymyr Kostyrko <arcade@b1t.name> To: freebsd-gnats-submit@FreeBSD.org Subject: bin/188535: ed/red - incorrectly sets current address upon removing last line Message-ID: <201404122136.s3CLaPgR084059@cgiserv.freebsd.org> Resent-Message-ID: <201404122140.s3CLe33p022029@freefall.freebsd.org>
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>Number: 188535
>Category: bin
>Synopsis: ed/red - incorrectly sets current address upon removing last line
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Apr 12 21:40:02 UTC 2014
>Closed-Date:
>Last-Modified:
>Originator: Volodymyr Kostyrko
>Release: ^/stable/10
>Organization:
none
>Environment:
FreeBSD kohrah.xim.bz 10.0-RELEASE-p1 FreeBSD 10.0-RELEASE-p1 #1 r264316M: Thu Apr 10 16:38:26 EEST 2014 root@kohrah.xim.bz:/usr/obj/usr/src/sys/MINIMAL amd64
>Description:
Let's have some file:
echo xxx > some_file
echo yyy >> some_file
Now let's try to edit it with ed, lines starting from '>' are manual input:
> ed some_file
8
> H
> =
2
> g/yyy/d
> =
2
> g/xxx/d
> =
0
> g/zzz/d
?
invalid address
When last line is removed from file current address is changed from 1 to 0 making all subsequent range addressing to fail. This violates the man page:
Since the g (global) command masks any errors from failed searches and
substitutions, it can be used to perform conditional operations in
scripts; --
What I mean is that actually using g (global) is not fully safe. Imagine I have a number of key fingerprints and I want to create a simple script to remove them from 'known_hosts' throughout all of my machines. There are a lot of fingerprints but each known_hosts file can contain only a few of them thus script may fail when file is running out of lines.
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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