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Extract certain lines from an output.

Extract certain lines from an output.

Hi everyone,

I understand that you can use


cat something.txt | sed -ne '1p'

cat something.txt | sed -ne '2,4p' 

to either extract one or several lines from an Output.

However ...

How can it be accomplished to extract several specific lines from an Output ?
Let's say I want only lines 2,5 and 8 ...


RE: Extract certain lines from an output.

Perfect, thanks a lot !

RE: Extract certain lines from an output.


Or try to formulate a rule, for your above example, each 3rd between the 2nd and 8th :


sed -ne '2,8{2~3p}' 
Of course, not a big deal in this case, however if the rule would say each 3rd between 2nd and 800th, enumeration would become abit painful.


RE: Extract certain lines from an output.

Feherke, the first~step syntax is valid only with GNU sed, not legacy sed.

RE: Extract certain lines from an output.


Thank you for the information, PHV.


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