Sed: Not working as expected. Search out one line, print next line

sumncguy · 10-02-2013, 02:24 PM

Test Data file called testfile

Quote:

voice-port 0/0/0
caller-id enable
voice-port 0/0/1
caller-id enable
voice-port 0/0/2
voice-port 0/0/3
caller-id enable
voice-port 1/0/0
voice-port 1/0/1
voice-port 1/0/2
voice-port 1/0/3
voice-port 1/0/14
voice-port 1/0/15

Code:

sed -n '/^voice\-port /{ N; / caller/p; }' testfile

Output

Quote:

voice-port 0/0/0
caller-id enable
voice-port 0/0/1
caller-id enable

What Im after - voice port line, followed by caller id line.

Quote:

voice-port 0/0/0
caller-id enable
voice-port 0/0/1
caller-id enable
voice-port 0/0/3
caller-id enable

Its clear to me that the lines "voice followed by voice" that do not follow the pattern are creating my problem, but Im not sure how to get around that. I have the sed pocket guide and searched the web but having found anything that would help.

Thanks in advance ...

colucix · 10-02-2013, 02:33 PM

What about this?

Code:

sed -n '/^voice-port /{N; /caller/!D; p}' testfile

the !D command causes the deletion of the content of the pattern space every time the next line doesn't match "caller" therefore it solves the voice followed by voice issue.

sumncguy · 10-02-2013, 03:21 PM

Thanks colucix .. that worked ... was racking my brain on that one. Hate it when I get stuck !!

Thanks again !!