some.sh

#!/bin/bash
 
# source a file of key/value that happens to be bash compliant
source ${DIRECTORY}/gadget.cfg
 
# get docker image size
SIZE="$(${DOCKER} images --format "{{.Size}}" ${name}_${uuid}-img)"
 
# get size in bytes from MB
B_SIZE=$(echo "scale=0; (1000*1000*$(echo ${SIZE} | ${SED} 's% MB%%g'))/1" | ${BC} -l)
 
# get transfer rate
echo "  - Estimated transfer time: $(echo "scale=1; ${B_SIZE}/800000" | bc -l)s"