教你使用shell监控网络的实时流量

mutougeda

直接上代码：

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• #!/bin/bash
• 
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• function usage
• {
•         echo "Usage: $0 "
•         echo "e.g. $0 eth0 2"
•         exit 1
• }
• if [ $# -lt 2 ];then
•         usage
• fi
• 
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• eth=$1
• interval=$2
• 
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• in_old=$(cat /proc/net/dev | grep -w $eth | sed -e "s/\(.*\)\:\(.*\)/\2/g" | awk '{ print $1 }' )
• out_old=$(cat /proc/net/dev | grep -w $eth | sed -e "s/\(.*\)\:\(.*\)/\2/g" | awk '{ print $9 }' )
• 
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• while true
• do
•     sleep ${interval}
•     in=$(cat /proc/net/dev | grep -w $eth | sed -e "s/\(.*\)\:\(.*\)/\2/g" | awk '{ print $1 }' )
•     out=$(cat /proc/net/dev | grep -w $eth | sed -e "s/\(.*\)\:\(.*\)/\2/g" | awk '{ print $9 }')
•     sub_in=$(( ($in-$in_old)/$interval ))
•     sub_out=$(( ($out-$out_old)/$interval ))
•     echo "Recv rate: $((${sub_in}/1024)) KB/s   Sent rate:  $((${sub_out}/1024)) KB/s "
•     in_old=${in}
•     out_old=${out}
• done
• exit 0
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输出：
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Recv rate: 1175 KB/s Sent rate: 29 KB/s
Recv rate: 1175 KB/s Sent rate: 29 KB/s
+ W9 v$ \& S# W! o7 N: RRecv rate: 1179 KB/s Sent rate: 31 KB/s
Recv rate: 987 KB/s Sent rate: 33 KB/s
Recv rate: 1159 KB/s Sent rate: 29 KB/s
Recv rate: 1167 KB/s Sent rate: 29 KB/s
+ s. X: s% Z% @4 LRecv rate: 1082 KB/s Sent rate: 27 KB/s
0 ^! v2 e# Q- r- h5 `5 ZRecv rate: 1085 KB/s Sent rate: 27 KB/s
Recv rate: 1129 KB/s Sent rate: 29 KB/s
; s  G, s: k. u7 FRecv rate: 954 KB/s Sent rate: 24 KB/s
Recv rate: 465 KB/s Sent rate: 18 KB/s
+ X6 L0 U/ n! |9 }) e- P' t* lRecv rate: 507 KB/s Sent rate: 14 KB/s
, C' L3 s) N" l1 @( B; zRecv rate: 1135 KB/s Sent rate: 30 KB/s
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　与dstat的对比：dstat -n -N peth1
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- Q- X& S4 n! z; S  g1 N: L6 ?1176k 30k
3 I( }) k0 n6 Z9 T5 P1176k 30k
1180k 31k
6 y; f, B2 g1 q/ y2 K987k 33k
5 t/ c1 P' Y! p1 }1159k 29k
1167k 30k
$ g$ J8 G$ S& m1083k 27k
1085k 27k
1129k 29k
& f0 l, R+ i; r; Z' c+ l955k 24k
0 l" x5 J7 s, c7 V466k 19k
508k 15k
1135k 30k
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ExxNEN

使用shell监控网络的实时流量