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awk to replace particular field

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# 1  
Old 06-03-2009
awk to replace particular field
i have bad data for instance, the use of capital letters in the middle of the word.
I identified the errors, made a list and put it in a file error_correction.txt
Incorrect,Correct
VeNOM,Venom
nos,NOS
.
.
.



My data file looks like this:
vgr,bugatti veron,,3.5,Venom,6,.......,....
vgr,lamborgini,,3.5,nos,6,.......,....
abc,bugatti veron,,3.5,Venom,6,.......,.......
.
.
.
.

I need to replace the terms in a the 5th field with that from the file.
How do i do this using awk??
# 2  
Old 06-03-2009
Hammer & Screwdriver An example to get you started...
Code:
> echo "867 5309 VerNOM 1234 Abcd"
867 5309 VerNOM 1234 Abcd

> echo "867 5309 VerNOM 1234 Abcd" | awk -v v1="VerNOM" -v v2="Vernom" '{gsub(v1,v2,$3);print}'
867 5309 Vernom 1234 Abcd

# 3  
Old 06-04-2009
Thanks Joeyg...
I was not quiet sure how to pull up values from another file from inside the awk!
how Do i use an ass. array[hash] inside awk??
# 4  
Old 06-04-2009
Try this:

Code:
awk -F, '
NR==FNR{a[$1]=$2;next}
a[$5]{$5=a[$5]}
1' error_correction.txt datafile

Regards
# 5  
Old 06-04-2009
im not quiet sure why this is happening...
the value changes inside the loop but is not being saved to the file!
# 6  
Old 06-04-2009
The file is can not be edited "in place" with awk. Redirect the output to a temporary file and replace the original file with it.

Code:
awk '<commands>' error_correction.txt datafile > tempfile
mv tempfile datafile

# 7  
Old 06-04-2009
cool...
awesome stuff
thanks a ton man....
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