script with increasing variable number

adelaide98 · 05-13-2009, 04:02 PM

ghostdog74, actually your explanations are very nice and incredibly helpful. thanks very much. the links to awk sites are also great- thanks!

here's what i came up with:

Code:

#!/bin/bash

awk '{
        if (($2" "$1) in animals)
                {print $2,$1> "animaltemp"}
        else {animals [$1" "$2]=""}}
END {
        for(i in animals) {print i>"animaltemp2"}
}' animals

This gives me

Code:

> more animaltemp
dog cat
hamster dog

and

Code:

> more animaltemp2
pig hamster
dog cat
wolf pig
hamster dog
columnA columnB

My final wish is to be able to create a file like animaltemp2 but with markings at dog cat and hamster dog so that I know that I removed reciprocals for them.

I tried to adapt an earlier script from coulcix with a grep and a while statement, but it didn't work. Could anyone tell me why and how to accomplish this last task? Here's what I tried:

Code:

#!/bin/bash
while read line
do
        if grep -qf animaltemp animaltemp2
        then
                echo $line recip deleted >> "animaltemp3"
        else
                echo $line >>"animaltemp3"
        fi
done < animaltemp2

the result is:

Code:

>more animaltemp3
pig hamster recip deleted
dog cat recip deleted
wolf pig recip deleted
hamster dog recip deleted
columnA columnB recip deleted

Much thanks again!

adelaide98 · 05-14-2009, 11:57 AM

I'm shocked that I figured it out (there was MUCH trial and error)...

Code:

grep -f animaltemp animaltemp2 | awk '{print $0, "recip" > "animaltemp3"}'
grep -vf animaltemp animaltemp2 >> animaltemp3

Thanks again to everyone who read this and helped.