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Date:      Tue, 25 Aug 2020 22:00:54 +0200
From:      Christoph Kukulies <kuku@kukulies.org>
To:        Ruben via freebsd-questions <freebsd-questions@freebsd.org>
Subject:   Sed pattern help - not FreeBSD related
Message-ID:  <6B02E882-D3EE-4721-B572-BFAF5C6BAC66@kukulies.org>
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[-- Attachment #1 --]
Excuses for asking a sed problem only without relation to FreeBSD:

I have a file el2 with the following content:

LOOP:	DC *+2
DO:	DC *+2
J:	DC *+2
ENCL:	DC *+2  PDP-11 VERSION OF ENCLOSE
KEY	DC *+2
EMIT	DC *+2
QTERM	DC *+2


With a sed command I will make it become:

LOOP:   DC LOOP+2
DO:	DO+2
J:	J+2
ENCL:	ENCL+2  PDP-11 VERSION OF ENCLOSE
KEY	KEY+2
EMIT	EMIT+2
QTERM	QTERM+2

In other words, the "*" should be replaced by the label in front of the line.
In case the line contains something after "+2“ (a comment), it should be appended.

The following sed command doesn’t work. Please no awk,perl,python or other script :)

$ sed  's/\(^[A-Z0-9]*\)\(:?\)\([ \t]*\)\(DC \*\+2\)\(.*$\)/\1\2\3DC \1+2/\5’ <el2


Thanks in advance,

—
Christoph




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