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Improve bash used in bwrate script

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Kevin MacMartin 2015-02-27 09:22:10 -05:00
parent c45becdd5c
commit 0f5dea490c
1 changed files with 15 additions and 16 deletions
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31
bwrate
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@ -1,27 +1,26 @@
#!/usr/bin/env bash #!/usr/bin/env bash
TIMESPAN=1 timespan=1
if [ -z $1 ]; then [[ -z "$1" ]] && {
echo "Error: no device specified" printf '%s\n' 'Error: no device specified'
exit 1 exit 1
fi }
if [ ! -d /sys/class/net/$1 ]; then [[ ! -d "/sys/class/net/$1" ]] && {
echo "No such device: $1" printf '%s\n' "No such device: $1"
exit 1 exit 1
fi }
BR1=`cat /sys/class/net/$1/statistics/rx_bytes` br1=$(</sys/class/net/"$1"/statistics/rx_bytes)
BT1=`cat /sys/class/net/$1/statistics/tx_bytes` bt1=$(</sys/class/net/"$1"/statistics/tx_bytes)
sleep $TIMESPAN sleep $timespan
BR2=`cat /sys/class/net/$1/statistics/rx_bytes` br2=$(cat /sys/class/net/"$1"/statistics/rx_bytes)
BT2=`cat /sys/class/net/$1/statistics/tx_bytes` bt2=$(cat /sys/class/net/"$1"/statistics/tx_bytes)
DOWNKB=$(((($BR2-$BR1) / $TIMESPAN) /1024)) u_speed=$(( ( ( bt2 - bt1 ) / timespan ) / 1024 ))
UPKB=$(((($BT2-$BT1) / $TIMESPAN) /1024)) d_speed=$(( ( ( br2 - br1 ) / timespan ) / 1024 ))
echo "D ${DOWNKB}KB/s | U ${UPKB}KB/s" printf '%s\n' "D ${d_speed}KB/s | U ${u_speed}KB/s"
exit 0