line processing slow

Hi,

I've a data file with 1million lines. Eg.

aaaaabbbbbbccccddd <- fix column
........
.......

I wanted to insert a comma ','.

This is what i did:

cat $inputfile | while read line
do
field1=`echo $line | cut -c1-5`
field2=`echo $line |cut -c6-11`
field3=`echo $line |cut -c12-15`
echo ${field1},${field2},${field3} >> outputfile
done

for 1million lines, the processing is painful.

Is there any more efficient way of doing the input/output?

Thanks and regards


.

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