如何使用sed提取子字符串
我有一个包含以下行的文件:
<parameter name="PortMappingEnabled" access="readWrite" type="xsd:boolean"></parameter> <parameter name="PortMappingLeaseDuration" access="readWrite" activeNotify="canDeny" type="xsd:unsignedInt"></parameter>
<parameter name="RemoteHost" access="readWrite"></parameter>
<parameter name="ExternalPort" access="readWrite" type="xsd:unsignedInt"></parameter>
<parameter name="ExternalPortEndRange" access="readWrite" type="xsd:unsignedInt"></parameter>
<parameter name="InternalPort" access="readWrite" type="xsd:unsignedInt"></parameter>
<parameter name="PortMappingProtocol" access="readWrite"></parameter>
<parameter name="InternalClient" access="readWrite"></parameter>
<parameter name="PortMappingDescription" access="readWrite"></parameter>
我想在此文件上执行命令以仅提取参数名称,如以下输出所示:
$sedcommand file.txtPortMappingEnabled
PortMappingLeaseDuration
RemoteHost
ExternalPort
ExternalPortEndRange
InternalPort
PortMappingProtocol
InternalClient
PortMappingDescription
这个命令可能是什么?
回答:
你要awk
。
这将是一个快速而肮脏的hack:
awk -F "\"" '{print $2}' /tmp/file.txt
PortMappingEnabledPortMappingLeaseDuration
RemoteHost
ExternalPort
ExternalPortEndRange
InternalPort
PortMappingProtocol
InternalClient
PortMappingDescription
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