grep and store two lines in other file

jkeertir · 02-16-2011, 07:00 AM

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