vnstat 的命令行用法

$ vnstat --help
 vnStat 1.11 by Teemu Toivola 

         -q,  --query          query database
         -h,  --hours          show hours
         -d,  --days           show days
         -m,  --months         show months
         -w,  --weeks          show weeks
         -t,  --top10          show top10
         -s,  --short          use short output
         -u,  --update         update database
         -i,  --iface          select interface (default: eth0)
         -?,  --help           short help
         -v,  --version        show version
         -tr, --traffic        calculate traffic
         -ru, --rateunit       swap configured rate unit
         -l,  --live           show transfer rate in real time

See also "--longhelp" for complete options list and "man vnstat".

demo:

[root@linux ~]# vnstat -m

 eth0  /  monthly

       month        rx      |     tx      |    total    |   avg. rate
    ------------------------+-------------+-------------+---------------
      Mar '12      4.02 GiB |   34.05 GiB |   38.06 GiB |  119.21 kbit/s
      Apr '12      8.92 GiB |   49.92 GiB |   58.85 GiB |  190.45 kbit/s
      May '12      9.28 GiB |   72.52 GiB |   81.80 GiB |  256.19 kbit/s
      Jun '12     12.94 GiB |  119.32 GiB |  132.26 GiB |  428.02 kbit/s
      Jul '12     24.23 GiB |  207.53 GiB |  231.76 GiB |  725.85 kbit/s
      Aug '12     30.54 GiB |  202.16 GiB |  232.69 GiB |  728.78 kbit/s
      Sep '12     45.72 GiB |  195.62 GiB |  241.34 GiB |  781.07 kbit/s
      Oct '12     57.53 GiB |  203.98 GiB |  261.51 GiB |  819.03 kbit/s
      Nov '12     65.30 GiB |  258.21 GiB |  323.51 GiB |    1.05 Mbit/s
      Dec '12     26.11 GiB |   93.76 GiB |  119.88 GiB |    1.09 Mbit/s
    ------------------------+-------------+-------------+---------------
    estimated     75.47 GiB |  271.00 GiB |  346.47 GiB |
[root@linux ~]#

补充：vnstat是一个Linux下的网络流量监控软件，通过记录指定网卡每日的传输流量日志（非基于网络包的过滤，而是分析文件系统 /proc)并可按周、月、日显示流量信息，vnStat无需root的权限就可使用。

＜完＞