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Select rows where the 3rd column value is over xx

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# 1  
Old 12-01-2010
Select rows where the 3rd column value is over xx
Hi All,
I've got a text file which is Postcode,Postcode, Travel_time and I want to select all of the rows where the 3rd column value is over 255. Can someone show me the magic on how to do this?
Originally it did contain 4 columns but i've managed to strip out the first 3 using:
cat textfile | awk -F, '{print $1, $2, $3}' > new_textfile

Thanks everyone
# 2  
Old 12-01-2010
Code:
awk -F, '$3>255' textfile

# 3  
Old 12-01-2010
All in one:
Code:
awk -F, '{NF=3}$3>255' OFS="," textfile

# 4  
Old 12-01-2010
To print the file,

awk -F, '$3>255 {print}' textfile
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