教你使用shell监控网络的实时流量

mutougeda

8 [$ i' h6 h9 D& v( e直接上代码：
% `( X' D- _- o
& Z5 Q: ]$ J2 k

• #!/bin/bash
• 
  
• function usage
• {
•         echo "Usage: $0 "
•         echo "e.g. $0 eth0 2"
•         exit 1
• }
• if [ $# -lt 2 ];then
•         usage
• fi
• 
  ' [+ N) u1 v$ u# \$ w/ _
• eth=$1
• interval=$2
• 
  3 ?# @2 _- E; [/ U$ T# f# j2 f7 a9 c3 n
• 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 }' )
• 
  
• 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
  

    　
0 f  f0 F. w9 C
输出：
% w( ~' y$ g7 O, u
Recv rate: 1175 KB/s Sent rate: 29 KB/s
9 R/ Y9 n6 i0 k( P6 ]' u6 URecv rate: 1175 KB/s Sent rate: 29 KB/s
Recv rate: 1179 KB/s Sent rate: 31 KB/s
, u" u! I0 N8 ?. r- MRecv 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
; X3 `- i+ r. d; H+ KRecv rate: 1082 KB/s Sent rate: 27 KB/s
. C4 b6 W- f' R$ b$ fRecv rate: 1085 KB/s Sent rate: 27 KB/s
# t4 J+ ?2 s( c- M5 DRecv rate: 1129 KB/s Sent rate: 29 KB/s
7 q- ?) n6 }9 E. Y, v* M+ sRecv rate: 954 KB/s Sent rate: 24 KB/s
Recv rate: 465 KB/s Sent rate: 18 KB/s
) B* m/ t: L' A% uRecv rate: 507 KB/s Sent rate: 14 KB/s
Recv rate: 1135 KB/s Sent rate: 30 KB/s

* O1 l- b# @& D- ^4 I4 ]' m" T" e　与dstat的对比：dstat -n -N peth1
; y# s# c; N3 P/ n, C  L
1176k 30k
0 O  x4 w5 G8 i7 r/ \. J/ d1176k 30k
1180k 31k
987k 33k
0 s& N" ^2 ^3 U  s. c$ E1159k 29k
1167k 30k
# ^+ `0 c( A. O$ B* @1083k 27k
1085k 27k
! I. t% \* R- r' Z* u+ U. T1129k 29k
955k 24k
466k 19k
508k 15k
1135k 30k

2 r; U: g1 P: t  M

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使用shell监控网络的实时流量