#!/bin/bash sdb_r=0 sdb_w=0 sdb_r_old=0 sdb_w_old=0 sdc_r=0 sdc_w=0 sdc_r_old=0 sdc_w_old=0 pretty(){ # Digest a single number into a pretty number num=$1 zero=000 tera=$(( $num / 1099511627776 )) num=$(( $num % 1099511627776 )) giga=$(( $num / 1073741824 )) num=$(( $num % 1073741824 )) mega=$(( $num / 1048576 )) num=$(( $num % 1048576 )) kilo=$(( $num / 1024 )) num=$(( $num % 1024 )) byte=${num:-0} one=byte && two=zero && sign=B [ $kilo -gt 0 ] && one=kilo && two=byte && sign=kB [ $mega -gt 0 ] && one=mega && two=kilo && sign=MB [ $giga -gt 0 ] && one=giga && two=mega && sign=GB [ $tera -gt 0 ] && one=tera && two=giga && sign=TB printf "%0.2f %s\n" $(eval echo \$$one.\$$two) $sign } while true do # Get new values eval $(printf 'sdb_r=%u sdb_w=%u' $(cat /sys/block/sdb/stat |tr -s ' ' | cut -d' ' -f4,8)) eval $(printf 'sdc_r=%u sdc_w=%u' $(cat /sys/block/sdc/stat |tr -s ' ' | cut -d' ' -f4,8)) # Compute diffs sdb_r_diff=$(( ($sdb_r - $sdb_r_old) * 512)) sdb_w_diff=$(( ($sdb_w - $sdb_w_old) * 512)) sdc_r_diff=$(( ($sdc_r - $sdc_r_old) * 512)) sdc_w_diff=$(( ($sdc_w - $sdc_w_old) * 512)) # Print the display printf "\r sdb: r %s w %s - sdc: r: %s w %s " \ "$(pretty $sdb_r_diff)" "$(pretty $sdb_w_diff)" \ "$(pretty $sdc_r_diff)" "$(pretty $sdc_w_diff)" # Save values sdb_r_old=$sdb_r sdb_w_old=$sdb_w sdc_r_old=$sdc_r sdc_w_old=$sdc_w # Sleep until the next cycle sleep 1 done
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