linux - How to use sed to extract substring -


i have file containing following lines:

  <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>

i want execute command on file extract parameter names displayed in following output:

$sedcommand file.txt portmappingenabled portmappingleaseduration remotehost externalport externalportendrange internalport portmappingprotocol internalclient portmappingdescription

what command?

you want awk.

this quick , dirty hack:

awk -f "\"" '{print $2}' /tmp/file.txt

portmappingenabled portmappingleaseduration remotehost externalport externalportendrange internalport portmappingprotocol internalclient portmappingdescription

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