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Add column to file A according to file B

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# 1  
Old 02-20-2014
Add column to file A according to file B
Hi, i have a file A like this:
Code:
JAT1
JAT2
JAT3
JAT4
JAT5
JAT6
...

and file B:
Code:
JAT2 1.2
JAT4 2.3
JAT6 1.5
...

How can i get a C file like this:
Code:
JAT1
JAT2 1.2
JAT3
JAT4 2.3
JAT5 1.5
JAT6
...

THANKS!!
# 2  
Old 02-20-2014
Code:
awk 'NR==FNR{A[$1]=$2;next}$1 in A{$2=A[$1]}1' fileB fileA

# 3  
Old 02-20-2014
Hi.

How are the output lines
Code:
JAT5 1.5
JAT6

obtained? ... cheers, drl
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