Extract certain lines from an output. 1

[TSch]

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 ...

Regards,
Thomas

 

[PHV]

What about this ?
sed -ne '2p;5p;8p'

Hope This Helps, PH.
FAQ219-2884
FAQ181-2886

 

[TSch]

Perfect, thanks a lot !

 

[feherke]

Hi

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

sed -ne '2,8{2~3p}'

Of course, not a big deal in this case, however if the rule would say each 3[sup]rd[/sup] between 2[sup]nd[/sup] and 800[sup]th[/sup], enumeration would become abit painful.

Feherke.
feherke.ga

 

[PHV]

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

 

[feherke]

Hi

Thank you for the information, PHV.


Feherke.
feherke.ga