return previous line for pattern match

braindrain · #1 (**permalink**) 06-26-2006

Hi,

Need some idea on file processing, I have file like below,

Code:

Processing al sources ...
...No value found : 
CHECK. 
Completed comparing all  sources.
Comparing schedulers...
Processing al targets ...
...No value found :

From above I need to extract the line where "No value found" is available, which is simple, but I also wanna print the line before i.e

Code:

Processing al sources ...
...No value found : 
Processing al targets ...
...No value found :

Can sometell me how to go about this ?

Thanks

vino · #2 (**permalink**) 06-26-2006

You never mentioned your OS. If you have GNU grep, the use

Code:

grep -B 1 "No value found" file

thestevew · #3 (**permalink**) 06-26-2006

If your grep has no -B (Aix hasn't) then:

Code:

sed -n -e 'N; /No Value Found/p' yourfile.txt

cheers

braindrain · #4 (**permalink**) 06-26-2006

sorry guys, didn't give enough information,this is in suse linux,

sed -n -e 'N; /No match/p' $1 worked perfect.... thanks..

ysrinu · #5 (**permalink**) 12-08-2008

Hi,
i tried
sed -n -e 'N; /No Value Found/p' yourfile.txt

but it only prints the previous line for the first match only.
thereafter only matching lines are printed and not their previous lines.

Thanks,
-srinivas yelamanchili

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