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jkeertir

02-16-2011 07:00 AM

grep and store two lines in other file

Dear all,

I have following contents

#1
aaaa
#2
bbb
#3
ccc

I want to grep "#2" and want the output as

#1
aaaa
#3
ccc

Please help me using shell script

With regards,
Keerti

AlucardZero

02-16-2011 07:06 AM

Code:

grep -vA1 "#2" foo.txt

Something like that?

macemoneta

02-16-2011 07:25 AM

This will do it:

Code:

grep -v "`grep -A1 '#2' filename`" filename

fordeck

02-16-2011 07:32 AM

If you want to store the output in a new file just add a redirection. For example using AlucardZero's code:

Code:

grep -vA1 "#2" foo.txt > newfile

Regards,

Fordeck

grail

02-16-2011 09:27 AM

Or if it doesn't have to be grep:

Code:

awk '/2/{getline;next}1' file

crts	02-16-2011 10:46 AM

Sed is another possibility to accomplish that:

Code:

sed -i '/^#2/ {N;d}' file

kurumi

02-16-2011 07:32 PM

Code:

$ ruby -ne 'gets && next if /^#2/;print ' file

#1

aaaa

#3

ccc

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