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Help with replace column one content based on reference file

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# 1  
Old 05-27-2011
Help with replace column one content based on reference file
Input file
Code:
1 testing 10 20 1
A testing 20 40 1
3 testing 23 232 2
1 testing 10 243 2
.
.

Reference file
Code:
1 final
3 used
.
.

Output file
Code:
final testing 10 20
A testing 20 40
used testing 23 232
final testing 10 243
.
.

I would like to replace those content that shown in column 1 of input file with the content that shown in reference file (if available).
Thanks.
# 2  
Old 05-27-2011
Code:
nawk 'FNR==NR{ref[$1]=$2;next} $1 in ref{$1=ref[$1]}1' refFile inputFile

# 3  
Old 05-27-2011
Code:
awk 'NR==FNR{a[$1]=$2;next}{$1=a[$1]?a[$1]:$1}1' ref_file input

This User Gave Thanks to bartus11 For This Post:
perl_beginner
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