Shell應用：監控下載速度

Shell應用：監控下載速度

事例：

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1. #!/bin/bash
2. # author: madding.lip
3. # date: 2011.10.08
5. echo -n "請輸入需要查詢的網卡的接口:"
6. read eth
7. echo "你要查詢的網卡接口為"$eth
8. echo -n "輸入需要等到的時間(秒):"
9. read sec
10. echo "你計算的是"$sec"秒內的平均流量"
11. infirst=$(awk '/'$eth'/{print $1 }' /proc/net/dev |sed 's/'$eth'://')
12. outfirst=$(awk '/'$eth'/{print $10 }' /proc/net/dev)
13. sumfirst=$(($infirst+$outfirst))
14. sleep $sec"s"
15. inend=$(awk '/'$eth'/{print $1 }' /proc/net/dev |sed 's/'$eth'://')
16. outend=$(awk '/'$eth'/{print $10 }' /proc/net/dev)
17. sumend=$(($inend+$outend))
18. sum=$(($sumend-$sumfirst))
19. echo $sec"秒內總流量為:"$sum"bytes"
20. aver=$(($sum/$sec))
21. echo "平均流量為:"$aver"bytes/sec"