如果下一行与另一个模式不匹配，则删除与模式匹配的行

Question

下面是我的检查脚本的提取输出，我只想打印主机名和错误。如果主机没有错误，也删除主机名条目。
我想使用的逻辑是删除现有行，如果下一行不匹配“NOT OK”
可以使用awk或sed...任何实用程序都适合模式匹配。

NSAS_HOST:d01-emsacssb01
NSAS_HOST:d01-emsacssb02
NSAS_HOST:emsacssbcon01
NOT OK main load processes
NOT OK 5.3% AXConfigurator
NOT OK eth0.orig is not UP, but ifcfg-eth0.orig sets ONBOOT=yes
NOT OK eth1.bak is not UP, but ifcfg-eth1.bak sets ONBOOT=yes
NOT OK eth1.orig is not UP, but ifcfg-eth1.orig sets ONBOOT=yes
NSAS_HOST:emsacssb03
NOT OK eth0.orig is not UP, but ifcfg-eth0.orig sets ONBOOT=yes
NOT OK eth1.orig is not UP, but ifcfg-eth1.orig sets ONBOOT=yes
NSAS_HOST:emsacsnb01
NSAS_HOST:emsacsnb02
NSAS_HOST:d02-emsacssb01
NSAS_HOST:d02-emsacssb02
NSAS_HOST:b2bcms01
NSAS_HOST:b2bcms02
NSAS_HOST:d02-b2bpgdb01
NOT OK bond0: device speed not determined
NOT OK bond1: device speed not determined

预期结果：

NSAS_HOST:emsacssbcon01
NOT OK main load processes
NOT OK 5.3% AXConfigurator
NOT OK eth0.orig is not UP, but ifcfg-eth0.orig sets ONBOOT=yes
NOT OK eth1.bak is not UP, but ifcfg-eth1.bak sets ONBOOT=yes
NOT OK eth1.orig is not UP, but ifcfg-eth1.orig sets ONBOOT=yes
NSAS_HOST:emsacssb03
NOT OK eth0.orig is not UP, but ifcfg-eth0.orig sets ONBOOT=yes
NOT OK eth1.orig is not UP, but ifcfg-eth1.orig sets ONBOOT=yes
NSAS_HOST:d02-b2bpgdb01
NOT OK bond0: device speed not determined
NOT OK bond1: device speed not determined

基本上：
1. 搜索词NSAS_HOST
2. 检查下一行NOT OK。如果它存在打印行，直到我们到达下一个NSAS_HOST
3。如果NOT OK不存在，则删除该NSAS_HOST行

Answer 1

与 sed ：

sed -ne '/NSAS_HOST/{N;/NOT OK/{p}};/NSAS_HOST/!p' FILE 

输出：

NSAS_HOST:emsacssbcon01
NOT OK main load processes
NOT OK 5.3% AXConfigurator
NOT OK eth0.orig is not UP, but ifcfg-eth0.orig sets ONBOOT=yes
NOT OK eth1.bak is not UP, but ifcfg-eth1.bak sets ONBOOT=yes
NOT OK eth1.orig is not UP, but ifcfg-eth1.orig sets ONBOOT=yes
NSAS_HOST:emsacssb03
NOT OK eth0.orig is not UP, but ifcfg-eth0.orig sets ONBOOT=yes
NOT OK eth1.orig is not UP, but ifcfg-eth1.orig sets ONBOOT=yes
NSAS_HOST:d02-b2bpgdb01
NOT OK bond0: device speed not determined
NOT OK bond1: device speed not determined