如何从脚本

时间：2015-09-25 16:28:11

标签： bash grep

我有一个脚本可以解析某个文件中的DNS信息。代码看起来像这样，并期望转储文件中的2行实例。 

nxdom_1st=`grep 'resulted in NXDOMAIN' $path_tmp/named.stats.tmp | awk '{ print $1 }' | grep -m1 ''`
nxdom_2nd=`grep 'resulted in NXDOMAIN' $path_tmp/named.stats.tmp | awk '{ print $1 }' | sort -n | grep -m1 ''`

然后，脚本中的另一个命令下面会告诉它减去结果：

if [ "$nxdom_1st" == '' ]
then
    nxdomain=0
else
    nxdomain=`expr $nxdom_1st - $nxdom_2nd`

问题是，转储文件最终包含4行＆＃34;导致NXDOMAIN＆＃34;，2表示实际DNS区域，2表示来自localhost，脚本无法处理它，因此我没有得到任何结果。例如，当转储文件包含如下模式时：

             [localhost.localdomain]
             [155.168.192.in-addr.arpa]
             20 queries resulted in NXDOMAIN
             20 queries resulted in NXDOMAIN

在这个例子中，＆＃34; 20＆＃34;导致问题的原因是它们来自查询自身的本地服务（我认为）。因此＆＃34; localhost.localdomain＆＃34;它始终出现在问题行之前。在服务器上我不想使用localhost禁用对自己的查询，因此如果上面的行包含[155.168.192.in-addr.arpa]或[]，如何修改脚本以丢弃结果的localhost.localdomain]

以下是脚本解析的文件转储。不幸的是，现在对localhost没有任何疑问，所以你不会看到我在上面发布的内容。 localhost.localdomain和[155.168.192.in-addr.arpa]行存在，只是没有在这两个stat转储上获取任何查询。同样，只有在这两行下面列出了查询时才会出现此问题，这就是为什么我想知道是否可以修改脚本中的grep字符串以排除任何＆＃34;导致NXDOMIAN＆＃34;结果可能会在之后直接发生。类似的东西，＆＃34;如果导致NXDOMAIN＆＃34;可以看到10行以下＆＃34; localhost.localdomain＆＃34;，忽略/丢弃等等。

--- Statistics Dump --- (1443199511)
[id.server (view: _bind)]
[authors.bind (view: _bind)]
[hostname.bind (view: _bind)]
[version.bind (view: _bind)]
[8.B.D.0.1.0.0.2.IP6.ARPA]
[B.E.F.IP6.ARPA]
[A.E.F.IP6.ARPA]
[9.E.F.IP6.ARPA]
[8.E.F.IP6.ARPA]
[D.F.IP6.ARPA]
[0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA]
[255.255.255.255.IN-ADDR.ARPA]
[113.0.203.IN-ADDR.ARPA]
[100.51.198.IN-ADDR.ARPA]
[2.0.192.IN-ADDR.ARPA]
[254.169.IN-ADDR.ARPA]
[127.IN-ADDR.ARPA]
[0.in-addr.arpa]
[1.0.0.127.in-addr.arpa]
[1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa]
[localhost]
[localhost.localdomain]
[155.168.192.in-addr.arpa]
[testdns.net]
++ Per Zone Query Statistics ++
              53 UDP/IPv6 send errors
              26 TCP/IPv4 connections accepted
             179 UDP/IPv4 connections established
              53 UDP/IPv6 socket connect failures
              25 TCP/IPv4 sockets closed
              53 UDP/IPv6 sockets closed
             181 UDP/IPv4 sockets closed
               2 TCP/IPv6 sockets opened
               2 TCP/IPv4 sockets opened
              54 UDP/IPv6 sockets opened
             182 UDP/IPv4 sockets opened
++ Socket I/O Statistics ++
[View: _bind (Cache: _bind)]
               4 NXDOMAIN
               1 !DS
               5 DNSKEY
               6 NSEC
              30 RRSIG
               9 DS
              42 AAAA
              20 NS
              75 A
[View: default]
++ Cache DB RRsets ++
[View: _bind]
              20 queries with RTT 100-500ms
             159 queries with RTT 10-100ms
              27 DNSSEC NX validation succeeded
              63 DNSSEC validation succeeded
              90 DNSSEC validation attempted
               2 IPv6 NS address fetch failed
              17 IPv6 NS address fetches
              17 IPv4 NS address fetches
              52 query retries
              18 NXDOMAIN received
             179 IPv4 responses received
              53 IPv6 queries sent
             179 IPv4 queries sent
[View: default]
[Common]
++ Resolver Statistics ++
               2 IPv4 notifies sent
++ Zone Maintenance Statistics ++
              54 queries caused recursion
             625 queries resulted in NXDOMAIN
            1270 queries resulted in non authoritative answer
             645 queries resulted in successful answer
            1251 responses with EDNS(0) sent
            1270 responses sent
            1251 requests with EDNS(0) received
            1270 IPv4 requests received
++ Name Server Statistics ++
[View: _bind]
              16 DLV
              22 DNSKEY
              15 DS
              39 AAAA
              12 NS
             128 A
[View: default]
++ Outgoing Queries ++
            1270 A
++ Incoming Queries ++
            1270 QUERY
++ Incoming Requests ++
+++ Statistics Dump +++ (1443199511)
--- Statistics Dump --- (1443199211)
[id.server (view: _bind)]
[authors.bind (view: _bind)]
[hostname.bind (view: _bind)]
[version.bind (view: _bind)]
[8.B.D.0.1.0.0.2.IP6.ARPA]
[B.E.F.IP6.ARPA]
[A.E.F.IP6.ARPA]
[9.E.F.IP6.ARPA]
[8.E.F.IP6.ARPA]
[D.F.IP6.ARPA]
[0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA]
[255.255.255.255.IN-ADDR.ARPA]
[113.0.203.IN-ADDR.ARPA]
[100.51.198.IN-ADDR.ARPA]
[2.0.192.IN-ADDR.ARPA]
[254.169.IN-ADDR.ARPA]
[127.IN-ADDR.ARPA]
[0.in-addr.arpa]
[1.0.0.127.in-addr.arpa]
[1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa]
**[localhost]
[localhost.localdomain]
[155.168.192.in-addr.arpa]**
[testdns.net]
++ Per Zone Query Statistics ++
              53 UDP/IPv6 send errors
              25 TCP/IPv4 connections accepted
             172 UDP/IPv4 connections established
              53 UDP/IPv6 socket connect failures
              24 TCP/IPv4 sockets closed
              53 UDP/IPv6 sockets closed
             174 UDP/IPv4 sockets closed
               2 TCP/IPv6 sockets opened
               2 TCP/IPv4 sockets opened
              54 UDP/IPv6 sockets opened
             175 UDP/IPv4 sockets opened
++ Socket I/O Statistics ++
[View: _bind (Cache: _bind)]
               4 NXDOMAIN
               2 !DS
               5 DNSKEY
               6 NSEC
              30 RRSIG
               9 DS
              43 AAAA
              20 NS
              75 A
[View: default]
++ Cache DB RRsets ++
[View: _bind]
              20 queries with RTT 100-500ms
             152 queries with RTT 10-100ms
              24 DNSSEC NX validation succeeded
              60 DNSSEC validation succeeded
              84 DNSSEC validation attempted
               2 IPv6 NS address fetch failed
              17 IPv6 NS address fetches
              17 IPv4 NS address fetches
              52 query retries
              16 NXDOMAIN received
             172 IPv4 responses received
              53 IPv6 queries sent
             172 IPv4 queries sent
[View: default]
[Common]
++ Resolver Statistics ++
               2 IPv4 notifies sent
++ Zone Maintenance Statistics ++
              50 queries caused recursion
             592 queries resulted in NXDOMAIN
            1203 queries resulted in non authoritative answer
             611 queries resulted in successful answer
            1185 responses with EDNS(0) sent
            1203 responses sent
            1185 requests with EDNS(0) received
            1203 IPv4 requests received
++ Name Server Statistics ++
[View: _bind]
              16 DLV
              21 DNSKEY
              14 DS
              39 AAAA
              12 NS
             123 A
[View: default]
++ Outgoing Queries ++
            1203 A
++ Incoming Queries ++
            1203 QUERY
++ Incoming Requests ++
+++ Statistics Dump +++ (1443199211)

好的，它现在正在发生，这是一个新的代码段转储文件。注意localhost.localdomain行下的查询信息：它在文件中出现两次。 

[localhost.localdomain]
[155.168.192.in-addr.arpa]
               1 queries resulted in NXDOMAIN
               1 queries resulted in nxrrset
               3 queries resulted in authoritative answer
               1 queries resulted in successful answerenter code here

[localhost]
[localhost.localdomain]
[155.168.192.in-addr.arpa]
               1 queries resulted in NXDOMAIN
               1 queries resulted in nxrrset
               3 queries resulted in authoritative answer
               1 queries resulted in successful answer

基本上我需要脚本忽略这些查询，只获取我正在使用的DNS区域的查询。

1 个答案:

答案 0 :(得分：0)

如果它一直只产生两行，那么你可以grep命令sed命令

使用grep：

grep -A 2 155.168.192.in-addr.arpa $path_tmp/named.stats.tmp

使用sed：

sed -n -e '/155.168.192.in-addr.arpa/,+2 p' $path_tmp/named.stats.tmp
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