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Sed or Grep to delete line containing patter plus extra line

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# 1  
Old 06-29-2010
Sed or Grep to delete line containing patter plus extra line
I'm new to using sed and grep commands, but have found them extremely useful. However I am having a hard time figuring this one out:

Delete every line containing the word CEN and the next line as well.
ie. test.txt

blue
324 CEN
green
red
blue
324 CEN
green
red
blue

to produce:

blue
red
blue
red
blue


I can delete the first line using either:

Code:
sed '/CEN/ d' test.txt

or
Code:
grep -v 'CEN' test.txt

I tried to extend this with sed by adding
Code:
 
sed '/CEN/,2d' test.txt

But this didn't work as well.
There is nothing to use as a marker in the second line I want to delete so I can't run two of these commands in series.

Any help would be greatly appreciated.
# 2  
Old 06-30-2010
Hi

Code:
sed '/CEN/{N;d;}' test.txt

Guru.
This User Gave Thanks to guruprasadpr For This Post:
rocketman88
# 3  
Old 06-30-2010
Thanks
Works well, thanks!
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