Bytes converter script.

[ProgramErgoSum]

Hi,
I wrote this script to test my shell scripting skills. This script converts bytes to KB, MB, GB and TB or back to lower units. The base factor is 1024 which is raised to an exponent based on the target size.

Can someone tell me how I can plus this into the ls -l command so that I can see file listing in KB, MB, etc. ?



#USAGE bconv n b|KB|MB|GB|TB b|KB|MB|GB|TB

usage_text () {
echo "USAGE : bconv n from_size to_size"
echo " from_size : b|KB|MB|GB|TB "
echo " to_size : b|KB|MB|GB|TB "
echo " bconv -h"
}

help_text () {
echo "bconv : A quick calculator to see bytes in different units"
echo "USAGE : bconv n b|KB|MB|GB|TB b|KB|MB|GB|TB "
echo "Example : bconv 93470746 b MB"
echo "Result : 93470746 b = 89.1406 MB"
}

check_args () {
#Filesize should be numeric

if ! [[ $FILE_SIZE =~ [[:digit:]] ]] ; then
echo "$FILE_SIZE File size argument is not numeric"
usage_text
exit 8
fi

#From filesize should be one of the size units
if ! [[ $FROM_SIZE =~ [b]|[KB]|[MB]|[GB]|[TB] ]] ; then
echo "$FROM_SIZE From file size argument is one of the size units"
usage_text
exit 8
fi

#To filesize should be one of the size units
if ! [[ $TO_SIZE =~ [b]|[KB]|[MB]|[GB]|[TB] ]] ; then
echo "$TO_SIZE To file size argument is one of the size units"
usage_text
exit 8
fi

#From and to size units should be different
if [ $FROM_SIZE = $TO_SIZE ] ; then
echo "No conversion done ! FROM and TO filesize units are same."
echo "${FILE_SIZE} ${FROM_SIZE} = ${FILE_SIZE} ${TO_SIZE}"
exit 4
fi

}

do_conversion () {
from_size=( "" "b" "KB" "MB" "GB" "TB" )
to_size=( "" "b" "KB" "MB" "GB" "TB" )
base_factor=1024

case ${FROM_SIZE} in
"b") from_unit=1 ;;
"KB") from_unit=2 ;;
"MB") from_unit=3 ;;
"GB") from_unit=4 ;;
"TB") from_unit=5 ;;
esac

case ${TO_SIZE} in
"b") to_unit=1 ;;
"KB") to_unit=2 ;;
"MB") to_unit=3 ;;
"GB") to_unit=4 ;;
"TB") to_unit=5 ;;
esac

if [ ${from_unit} -lt ${to_unit} ] ; then
let "expo=$to_unit-$from_unit"
new_size=$( echo "scale=4; ${FILE_SIZE}/${base_factor}^${expo}" | bc)
else
let "expo=$from_unit-$to_unit"
new_size=$( echo "scale=2; ${FILE_SIZE}*${base_factor}^${expo}" | bc)
fi
}


# Check arguments.
case $# in
3) FILE_SIZE="$1"
FROM_SIZE="$2"
TO_SIZE="$3"
check_args ${FILE_SIZE} ${FROM_SIZE} ${TO_SIZE}
do_conversion ${FILE_SIZE} ${FROM_SIZE} ${TO_SIZE}
echo "${FILE_SIZE} ${FROM_SIZE} = ${new_size} ${TO_SIZE}"
exit 0
;;
1) getopts "h" option
help_text ${one_arg}
exit 4
;;
*) usage_text
exit 4
;;
esac