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Shell Programming and Scripting

merge files like VLOOKUP

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# 1  
Old 11-04-2010
merge files like VLOOKUP
I would like to merge data from a reference file and a data file to produce a new output file as shown below.
Reference file,data file,output file
a , b 2 , a 0
b , d 4 , b 2
c , , c 0
d , , d 4
e, , e 0
# 2  
Old 11-04-2010
Code:
$ cat dat
b 2
d 4
$ cat ref
a
b
c
d
e
$ awk '{F+=(FNR==1)
>   if (F==1) val[$1]=$2
>   if (F==2) print $1, val[$1] ? val[$1] : 0}' dat ref
a 0
b 2
c 0
d 4
e 0

Last edited by Chubler_XL; 11-04-2010 at 01:17 AM..
# 3  
Old 11-30-2010
re vlookup
Thankyou very much. It worked well!
# 4  
Old 11-30-2010
Code:
awk 'NR==FNR{a[$1]=$2;next} {print $1,a[$1]?a[$1]:0}' dat ref

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