#!/bin/bash # Digest a single number into a pretty number pretty(){ # Initialization num=${1:-0} zero=0 tera_mag=1099511627776 giga_mag=1073741824 mega_mag=1048576 kilo_mag=1024 byte_mag=1 # Scale down to appropriate magnitude tera=$(( $num / ${tera_mag} )) num=$(( $num % ${tera_mag} )) giga=$(( $num / ${giga_mag} )) num=$(( $num % ${giga_mag} )) mega=$(( $num / ${mega_mag} )) num=$(( $num % ${mega_mag} )) kilo=$(( $num / ${kilo_mag} )) num=$(( $num % ${kilo_mag} )) byte=${num:-0} # Select proper magnitude and suffix one=byte && two=zero && sign=B [ $kilo -gt 0 ] && one=kilo && two=byte && suffix=kB [ $mega -gt 0 ] && one=mega && two=kilo && suffix=MB [ $giga -gt 0 ] && one=giga && two=mega && suffix=GB [ $tera -gt 0 ] && one=tera && two=giga && suffix=TB # Compute float whole=$(eval echo \$$one) part=$(eval echo \$$two) num=$(printf "%s.%s" "${whole}" "${part}") # Compute printf format fmt="%0.2f%s\n" [ "${whole}" -gt 9 ] && fmt="%0.1f%s\n" [ "${whole}" -gt 99 ] && fmt="%0.0f%s\n" [ "${two}" = "zero" ] && fmt="%0.0f%s\n" # Generate result printf "${fmt}" "${num}" "${suffix}" } digest(){ dev="${1}" if [ ! -d "/sys/block/${dev}" ] then return 1 fi eval $(printf 'old_r=$old_r_%s old_w=$old_w_%s' "${dev}" "${dev}") [ -z "${old_r}" ] && old_r=0 [ -z "${old_w}" ] && old_w=0 eval $(awk '{print "cur_r=" $3 " cur_w=" $7}' /sys/block/${dev}/stat) dif_r=$(( (${cur_r} - ${old_r}) * 512 )) dif_w=$(( (${cur_w} - ${old_w}) * 512 )) eval $(printf "old_r_%s=%u old_w_%s=%u" "${dev}" "${cur_r}" "${dev}" "${cur_w}") printf "%s: R: %s W: %s \033[K\n" "${dev}" "$(pretty ${dif_r})" "$(pretty ${dif_w})" } while true do printf "\033[0;0H" # Cursor to upper left for I in /sys/block/sd? do digest "$(basename "${I}")" done printf "\033[0J" # Clear the rest of the page sleep 1 done