主题：获取网卡的流量
ifconfig 查看流量
文件流量数据量
脚本内容
#!/bin/bash
#name: mark
# check network dev's liuliang
nic=$1
echo -e "In -----Out"
while true;do
old_in=$(awk '/'$nic'/{print $2}' /proc/net/dev)
old_out=$(awk '/'$nic'/{print $10}' /proc/net/dev)
sleep 1
new_in=$(awk '/'$nic'/{print $2}' /proc/net/dev)
new_out=$(awk '/'$nic'/{print $10}' /proc/net/dev)
in=$(printf "%.1f%s" "$((($new_in-$old_in)/1024))" "KB/S")
out=$(printf "%.1f%s" "$((($new_out-$old_out)/1024))" "KB/S")
echo "$in $out"
done
小结：
printf "%.1f%s" "1.2333" "kb/s" --> 1.2kb/s