1. Some formatting / proc file output
Output content in some Linux proc file really can not see, such as /proc/net/snmpthe output is as follows:
[root@localhost ~]# cat /proc/net/snmp
Ip: Forwarding DefaultTTL InReceives InHdrErrors InAddrErrors ForwDatagrams InUnknownProtos InDiscards InDelivers OutRequests OutDiscards OutNoRoutes ReasmTimeout ReasmReqds ReasmOKs ReasmFails FragOKs FragFails FragCreates
Ip: 2 64 1112736 0 0 0 0 0 1112733 1112545 0 36 0 0 0 0 0 0 0
Icmp: InMsgs InErrors InCsumErrors InDestUnreachs InTimeExcds InParmProbs InSrcQuenchs InRedirects InEchos InEchoReps InTimestamps InTimestampReps InAddrMasks InAddrMaskReps OutMsgs OutErrors OutDestUnreachs OutTimeExcds OutParmProbs OutSrcQuenchs OutRedirects OutEchos OutEchoReps OutTimestamps OutTimestampReps OutAddrMasks OutAddrMaskReps
Icmp: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Tcp: RtoAlgorithm RtoMin RtoMax MaxConn ActiveOpens PassiveOpens AttemptFails EstabResets CurrEstab InSegs OutSegs RetransSegs InErrs OutRsts InCsumErrors
Tcp: 1 200 120000 -1 2207 2204 4 598 3803 1112646 1112462 0 0 303 0
Udp: InDatagrams NoPorts InErrors OutDatagrams RcvbufErrors SndbufErrors InCsumErrors IgnoredMulti
Udp: 176 0 0 91 0 0 0 0
UdpLite: InDatagrams NoPorts InErrors OutDatagrams RcvbufErrors SndbufErrors InCsumErrors IgnoredMulti
UdpLite: 0 0 0 0 0 0 0 0
The first field is the row, the second row is the value of the field. These outputs are too many fields contained in each row, aligned not any fields and values, looking too hard, then a awkcommand to format the output such later for easy viewing.
awkCommand is as follows:
awk '{\
if (NR % 2 == 0) print $1;\
for(i = 2; i <= NF; i++) {\
if (NR % 2 ) \
count[i] = $i;\
else if ($i > 0) \
printf(" %-28s:%d\n",count[i], $i);\
}\
}' \
/proc/net/snmp
Effect formatted as follows:
Ip:
Forwarding 2
DefaultTTL 64
InReceives 2252593
InDelivers 2252590
OutRequests 2252398
OutNoRoutes 36
Icmp:
Tcp:
RtoAlgorithm 1
RtoMin 200
RtoMax 120000
ActiveOpens 3807
PassiveOpens 3804
AttemptFails 4
EstabResets 598
CurrEstab 7003
InSegs 2252503
OutSegs 2252315
OutRsts 303
Udp:
InDatagrams 176
OutDatagrams 91
UdpLite:
Print command field and a value above the non-zero value according to the format. The command is also suitable /proc/net/netstatfile.
Binding watchorder to obtain the timing can view the changes in these values, the following command:
watch -n 1 "awk '{if (NR % 2 == 0) print \$1;for(i = 2; i <= NF; i++) {if (NR % 2 ) count[i]=\$i; else if (\$i > 0 ) printf(\" %-28s%d\n\",count[i], \$i);}}' /proc/net/netstat"
Further, watchthe command can only see the value of a statistical point in time, if you want to see change in value per second, is not so easy, it took me some time to write the following command to achieve this effect:
echo '' > tmp.txt; \
for((i = 1; ; i++)); do \
awk '{for(i = 2; i <= NF; i++) {if (NR % 2 ) count[i] = $i; else if ($i > 0 ) print count[i], $i;}}' \
/proc/net/snmp /proc/net/netstat >> tmp.txt; \
if [ `expr $i % 2` == 0 ]; then \
printf "\033c"; \
awk '{if (a[$1]) {if ($2 != a[$1]) printf("%-28s%d\n", $1, $2 - a[$1])} else a[$1] = $2;}' tmp.txt; \
echo '' > tmp.txt;\
else \
sleep 1;\
fi; \
done
This command per output /proc/net/snmpand /proc/net/netstatfile value changes, the output format is as follows:
InReceives 76931
InDelivers 76931
OutRequests 76931
InMsgs 4
InEchos 2
InEchoReps 2
OutMsgs 4
OutEchos 2
OutEchoReps 2
InType0 2
InType8 2
OutType0 2
OutType8 2
ActiveOpens 200
PassiveOpens 166
EstabResets 200
CurrEstab 132
InSegs 76927
OutSegs 76927
OutRsts 100
DelayedACKs 1114
DelayedACKLocked 2
ListenOverflows 34
ListenDrops 34
TCPHPHits 15774
TCPPureAcks 339
TCPHPAcks 35402
TCPAbortOnClose 100
TCPOrigDataSent 41348
InOctets 46293624
OutOctets 46300484
InNoECTPkts 77482