Shell Programming and Scripting

I have 2 files

file1:

Code:

192.168.1.1 ABC
192.168.1.2 AAA

file 2:

Code:

BBB 192.168.1.1
CCC 192.168.1.2
DDD 192.168.1.3

Output:

Code:

192.168.1.1 ABC BBB
192.168.1.2 AAA CCC

The basic thing I want to do is that I want to match ip addresses and if they match, print the matching lines from file1 and append the first field of the matching lines from file2.
I am trying to use grep -f and awk to achieve this, but I can't get the output right.

192.168.1.1 appears two times in file2. How d you want to handle this case?

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Code:

awk 'NR==FNR{a[NR$2]=$1;next}{print $0,a[FNR$1]}' file2 file1

Sorry that was a typo on my part. I edited my post to address that.

---------- Post updated at 12:31 PM ---------- Previous update was at 12:14 PM ----------

Hi, thank you so much for your help, but I just tried this and it is not outputting correctly.

Use GNU awk (gawk), New awk (nawk) or POSIX awk (/usr/xpg4/bin/awk)

Yes, sorry your example works for my example. However, with different IP addresses it doesn't seem to be working. For example:

Code:

File 1:
192.168.1.1 ABC
192.168.1.2 AAA
10.10.1.23 weeee

File 2:
BBB 192.168.1.1
CCC 192.168.1.2
DDD 192.168.1.3
yaaa 10.10.1.23

awk 'NR==FNR{a[NR$2]=$1;next}{print $0,a[FNR$1]}' file2 file1

The following output produces:

Code:

192.168.1.1 ABC BBB
192.168.1.2 AAA CCC
10.10.1.23 weeee