On Wed, 19 May 2004 12:06:18 -0500
"Michael French" <mfrench@xxxxxxxxxxxxxxxxx> wrote:
> I have two text files each with a single column of numbers in them
>
> and I want to write a script that multiplies the number on each line
> of file one with the corresponding number from file two and produces a
> sum of the multiplied numbers in the 2 files.. How would I do this
> with a loop? This is just a small shell script, I can use perl if I
> need to, I just need to know the data structure. If it was just one
> file, I would do something like this:
Putting everything into arrays makes it easy to use the values of the
data and results if you need to do something with them later.
Thank you
Russell
#!/bin/sh
### Variables ###
# First file containing column of numbers
FILE1=/path/file1
# Number of column in first file that contains numbers to be used
COLUMN1=1
# Second file containing column of numbers
FILE2=/path/file2
# Number of column in second file that contains numbers to be used
COLUMN2=1
### Declare Arrays ###
declare -a NUMBER_FILE1
declare -a NUMBER_FILE2
declare -a PRODUCT
### FUNCTIONS ###
MULTIPLY () {
# Pull a column out of two files and multiple
# Populate arrays with data and result
#
if [ -r $FILE1 ] ; then
NUMBER_FILE1=(`awk '{print $COLUMN1}' $FILE1`)
if [ -r $FILE2 ] ; then
NUMBER_FILE2=(`awk '{print $COLUMN2}' $FILE2`)
if [ ${#NUMBER_FILE1[@]} = ${#NUMBER_FILE2[@]} ] ; then
for (( x=0 ; x<${#NUMBER_FILE1[@]} ; x++ )) ; do
let PRODUCT[$x]=${NUMBER_FILE1[$x]}*${NUMBER_FILE2[$x]}
done
else
echo "Variance in data structure"
exit 1
fi
else
echo "$FIL2 is not readable"
fi
else
echo "$FILE1 is not readable"
fi
} # End MULTIPLY
### MAIN ###
MULTIPLY
echo ${PRODUCT[@]}
for (( y=0 ; y<${#PRODUCT[@]} ; y++ )) ; do
echo "${NUMBER_FILE1[$y]}*${NUMBER_FILE2[$y]}=${PRODUCT[$y]}"
done
exit 0
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