CODEWITHSUNDEEP
stringunixawksed
Johnykutty
Johnykutty

Reputation: 12829

Delete everything after pattern including pattern

I have a text file like

some
important
content
goes here
---from here--
some 
unwanted content

I am trying to delete all lines after ---from here-- including ---from here--. That is, the desired output is 

some
important
content
goes here

I tried sed '1,/---from here--/!d' input.txt but it's not removing the ---from here-- part. If I use sed '/---from here--.*/d' input.txt, it's only removing ---from here-- text.

How can I remove lines after a pattern including that pattern?

EDIT

I can achieve it by doing the first operation and pipe its output to second, like sed '1,/---from here--/!d' input.txt | sed '/---from here--.*/d' > outputput.txt.
Is there a single step solution?

Upvotes: 2

Views: 270

Answers (5)

stack0114106
stack0114106

Reputation: 8711

You can try Perl

perl -ne ' $x++ if /---from here--/; print if !$x '

using your inputs..

$ cat johnykutty.txt
some
important
content
goes here
---from here--
some
unwanted content

$ perl -ne ' $x++ if /---from here--/; print if !$x ' johnykutty.txt
some
important
content
goes here

$

Upvotes: 0

Tyl
Tyl

Reputation: 5252

Another awk approach:

awk '/---from here--/{exit}1' file

If you have GNU awk 4.1.0+, you can add -i inplace to change the file in-place.
Otherwise appened | tee file to change the file in-place.

Upvotes: 2

RavinderSingh13
RavinderSingh13

Reputation: 133428

Could you please try following(in case you are ok with awk).

awk '/--from here--/{found_from=1} !found_from{print}' Input_file

Upvotes: 1

David R Tribble
David R Tribble

Reputation: 12204

I'm not positive, but I believe this will work:

sed -n '/---from here--/q; p' file

The q command tells sed to quit processing input lines after matching a given line.

Upvotes: 1

SLePort
SLePort

Reputation: 15461

Another approach with sed:

sed '/---from here--/,$d' file

The d(delete) command is applied to all lines from first line containing ---from here-- up to the end of file($)

Upvotes: 3

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