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and subject line Bug#296792: sed: s/^#*lock$/#lock/2 replaces nothing while
s/^#*lock$/#lock/ replaces every occourence
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From: Gregor Zattler <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: sed: s/^#*lock$/#lock/2 replaces nothing while s/^#*lock$/#lock/
replaces
every occourence
Reply-To: Gregor Zattler <[EMAIL PROTECTED]>
X-Mailer: reportbug 3.8
Date: Thu, 24 Feb 2005 19:01:53 +0100
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Package: sed
Version: 4.1.4-2
Severity: normal
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Hi,
I want to stream edit grub's menu.lst. I want to unlock one
specific entry in menu.lst. This file contains several lines
whitch match "^lock$" (according to grep).
According to sed's info file the s(ubstitute) command accepts an
optional flag "number" which determines to substitute only the
"number'th" occourence of the pattern.
But with tis command line:
/bin/sed -e "s/^#*lock/#lock/2" /boot/grub/menu.lst >/tmp/nuk
nothing gets substituted,
Wheareas with:
/bin/sed -e "s/^#*lock/#lock/g" /boot/grub/menu.lst >/tmp/nuk
every occurence of "^lock$" gets substituted. This is correct.
But:
/bin/sed -e "s/^#*lock/#lock/" /boot/grub/menu.lst >/tmp/nuk
also substitutes ever occurence of "^lock$". Shouldn't it only
substitute the first occurence?
Thnis is very easy testable with a file like this:
lock
lock
lock
lock
lock
lock
lock
lock
lock
lock
lock
lock
lock
lock
lock
lock
lock
Perhaps related:
I use reportbug (1) to report this bug. First it scans the
installation of the package in question. in this case it gave
the following output:
> Getting status for sed...
> Verifying package integrity...
> There may be a problem with your installation of sed;
> the following files appear to be missing or changed:
>
> Do you still want to file a report [y|N|q|?]?
But there is no file displayed. I reinstalled sed and started
reportbug again: Same message.
I attach my menu.lst
- -- System Information:
Debian Release: 3.1
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.10-grsec
Locale: [EMAIL PROTECTED], [EMAIL PROTECTED] (charmap=ISO-8859-15)
Versions of packages sed depends on:
ii libc6 2.3.2.ds1-20 GNU C Library: Shared libraries an
- -- no debconf information
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (GNU/Linux)
iD8DBQFCHhaR8uuCWtJTB8oRAlNwAJ46ZFP9NXc3MZxAfrGU6FK9D0wsPwCfcI/A
V7cRSIWZkYxyj3Ab+e5GqgU=
=C2sJ
-----END PGP SIGNATURE-----
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Date: Thu, 24 Feb 2005 20:26:05 -0500
From: Clint Adams <[EMAIL PROTECTED]>
To: Gregor Zattler <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
Subject: Re: Bug#296792: sed: s/^#*lock$/#lock/2 replaces nothing while
s/^#*lock$/#lock/ replaces every occourence
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> But with tis command line:
> /bin/sed -e "s/^#*lock/#lock/2" /boot/grub/menu.lst >/tmp/nuk
> nothing gets substituted,
>
> But:
> /bin/sed -e "s/^#*lock/#lock/" /boot/grub/menu.lst >/tmp/nuk
> also substitutes ever occurence of "^lock$". Shouldn't it only
> substitute the first occurence?
You misunderstand. /2 is not the second occurrence in the file, /2 is
the second occurrence in each line.
Similarly, without the /2 it is the first occurrence in each line, and
with /g it is every occurrence in every line.
What you want to do is something different.
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