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left join using awk

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# 1  
Old 06-21-2012
left join using awk
Hi guys,

I need to use awk to join 2 files

file_1
A 001
B 002
C 003

file_2
A XX1
B XX2

output desired
A 001 XX1
B 002 missing
C 003 XX2

thank you!
# 2  
Old 06-21-2012
Didn't you mean that file_2 contains :
Code:
A XX1
C XX2

???

So it could be something like :

Code:
awk 'NR==FNR{A[$1]=$2;next}{print$0 FS (A[$1]?A[$1]:"missing")}' file_2 file_1

Otherwise i don't get the logic of your output
This User Gave Thanks to ctsgnb For This Post:
g1org1o
# 3  
Old 06-21-2012
Hi ctsgnb

I was wrong.. I meant

file_1
A 001
B 002
C 003

file_2
A XX1
B XX2

output desired
A 001 XX1
B 002 XX2
C 003 missing

anyway your awk script works! Thank you!
Last edited by g1org1o; 06-21-2012 at 10:11 PM..
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