从指定文件的指定段中获得指定字符

neten

形如：
lease 192.168.9.193 {
  starts 6 2009/05/16 02:32:38;
  ends 6 2009/05/16 06:32:38;
  tstp 6 2009/05/16 06:32:38;
  binding state free;
  hardware ethernet 00:19:d1:0f:06:d7;
  uid "\001\000\031\321\017\006\327";
}
lease 192.168.9.96 {
  starts 6 2009/05/16 06:37:19;
  ends 6 2009/05/16 10:37:19;
  binding state active;
  next binding state free;
  hardware ethernet 00:21:97:01:f1:22;
  uid "\001\000!\227\001\361\"";
  client-hostname "x04";
}
lease 192.168.9.72 {
  starts 6 2009/05/16 02:38:32;
  ends 6 2009/05/16 06:38:32;
  tstp 6 2009/05/16 06:38:32;
  binding state free;
  hardware ethernet 08:00:27:b9:a9:a7;
  uid "\001\010\000'\271\251\247";
}
如何以最简单的形式得到最后一段中starts一行中的2009/05/16 02:38:32时间？

ywlscpl

awk '/starts/' file |tail -1|awk '{$1="";$2="";print}'

寂寞烈火

try
awk 'BEGIN{RS="}“}END{print $6,$7}'

neten

不好意思，搞错了，文件中可能还会有注释，形如：
# All times in this file are in UTC (GMT), not your local timezone.   This is
# not a bug, so please don't ask about it.   There is no portable way to
# store leases in the local timezone, so please don't request this as a
# feature.   If this is inconvenient or confusing to you, we sincerely
# apologize.   Seriously, though - don't ask.
# The format of this file is documented in the dhcpd.leases(5) manual page.
# This lease file was written by isc-dhcp-V3.0.4

lease 192.168.9.62 {
  starts 5 2008/10/17 01:50:37;
  ends 5 2008/10/17 01:52:37;
  tstp 5 2008/10/17 01:52:37;
  binding state free;
  hardware ethernet 00:03:ff:01:98:c9;
}
lease 192.168.9.61 {
  starts 0 2008/10/19 05:52:09;
  ends 0 2008/10/19 09:52:09;
  tstp 0 2008/10/19 09:52:09;
  binding state free;
  hardware ethernet 00:03:ff:00:98:c9;
  uid "\001\000\003\377\000\230\311";
}
lease 192.168.9.123 {
  starts 1 2008/10/20 03:32:36;
  ends 1 2008/10/20 07:32:36;
  tstp 1 2008/10/20 07:32:36;
  binding state free;
  hardware ethernet 00:1d:60:48:57:82;
  uid "\001\000\035`HW\202";
}

neten

原帖由 寂寞烈火 于 2009-5-16 16:42 发表
try
awk 'BEGIN{RS="}“}END{print $6,$7}'

laoda：
好像是第一段的时间吧。


其实我就是想记录dhcp服务器最后一个租约的开始时间。

ywlscpl

严格点的

1. awk '$1=="lease"&&$3=="{"{T=1;next}T&&$1=="starts"{print $3,$4;T=0}' file|tail -1

复制代码

neten

原帖由 ywlscpl 于 2009-5-16 16:41 发表
awk '/starts/' file |tail -1|awk '{$1="";$2="";print}'

修改了一下：
awk '/starts/' dhcpd.leases |tail -1|awk 'BEGIN{FS="[ ;]"}{print $5,$6}'

neten

原帖由 ywlscpl 于 2009-5-16 17:05 发表
严格点的
awk '$1=="lease"&&$3=="{"{T=1;next}T&&$1=="starts"{print $3,$4;T=0}' file|tail -1

这位大哥，可否给小弟解释一下？

寂寞烈火

原帖由 neten 于 2009-5-16 16:57 发表

laoda：
好像是第一段的时间吧。


其实我就是想记录dhcp服务器最后一个租约的开始时间。

tbocd

原帖由 neten 于 2009-5-16 16:34 发表
形如：
lease 192.168.9.193 {
  starts 6 2009/05/16 02:32:38;
  ends 6 2009/05/16 06:32:38;
  tstp 6 2009/05/16 06:32:38;
  binding state free;
  hardware ethernet 00:19:d1:0f:06:d7;
  uid  ...

针对这题，可以这样：
awk '/starts/ {print $3" "$4}' file