awk print lines that doesn't have a pattern

huynguye · 05-02-2006, 06:38 PM

Hi,

I'm looking for a way to print out lines that do not have the words Mozilla, Opera or JanusUtils.

So far I can print the lines that have Mozilla, but I am unsure how to do this for multiple words and to not print them instead of printing them.

Code:

awk '/Mozilla/ {print}'

Any help is appreciated. Thanks,
Huy

taylor_venable · 05-02-2006, 08:39 PM

If you're not tied to using Awk, GNU Grep can do it:

Code:

grep -Ev 'Mozilla|Opera|JanusUtils'

The -v option means show lines that don't match, -E means use extended regular expressions (seems to be required to use the pipe [which means "or"] correctly).

huynguye · 05-03-2006, 02:29 PM

Quote:

Originally Posted by taylor_venable

If you're not tied to using Awk, GNU Grep can do it:

Code:

grep -Ev 'Mozilla|Opera|JanusUtils'

The -v option means show lines that don't match, -E means use extended regular expressions (seems to be required to use the pipe [which means "or"] correctly).

That works, but unfortunately I am tied to using Awk. From your example, I was able to expand to this now

Code:

awk '/Mozilla|Opera|JanusUtils/ {printf "%s\t%s\t%s\n",$12,$4,$1 }'

There must be a way to not print those finds. =/

taylor_venable · 05-03-2006, 08:58 PM

OK, in that case, you can use an "if" statement. This file will check for (the lack of) a match on variable $1:

Code:

{
    if ( $1 !~ /Mozilla|Opera|JanusUtils/ ) {
        print $1;
    }
}

It's a little less flexible than being able to match the entire line, but if what you're looking for can only occur in one column, it should work. Otherwise... I'd have to dig through my Awk book some more.

huynguye · 05-04-2006, 01:59 AM

Thanks that worked and made me think of another possible solution.

Code:

awk '!/Mozilla|Opera|JanusUtils/ {printf "%s\t%s\t%s\n",$12,$4,$1 }'

I tried adding the ! and it worked!! I should've thought of that earlier =P Thanks for the inspiration!

taylor_venable · 05-04-2006, 11:08 AM

Cool; I had no idea that feature existed. I guess it just shows that the best way to learn around Unix is through experimentation.