Shell Programming and Scripting

Whats up fellas, I am new here... just wanted to see if anyone knew a way to get an avergage of a list of numbers... I am trying to use bc (number of records in file divided by sum of all records in file) but it is not giving me accurate data.

IE:

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COUNT=`wc -l $datafile | awk '{print $1}'`


SUM=`sumfld $datafile 2 | awk '{print $NF}' #sumfld is internal utilty to add contents of datafile's feild

AVG=`echo "$SUM / $COUNT" | bc`
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I find that if the $COUNT=2, and $SUM=9.99, $AVG should be be about 4.995, but instead it just returning 4. Any help would be appreciated.

Try:
AVG=`echo "scale=3 ; $SUM / $COUNT" | bc`

Could do it all in awk:

awk '{sum+=$2}END{print sum/NR}' datafile

returns the average of the second field.