I ran it on the input you provided, I changed the 2nd file a bit more and got the following result: 
- 5 /system/security/management-ip/protocol/shutdown
+ 5 /system/security/management-ip/protocol/reboot
- 7 /system/security/management-ip/protocol/entry 1
- 8 /system/security/management-ip/protocol/entry 1/snmp ok
+ 7 /system/security/management-ip/protocol/entry 2
+ 8 /system/security/management-ip/protocol/entry 2/snmp ok

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In reply to Re^3: Finding the parent of a text in a file by choroba
in thread Finding the parent of a text in a file by ExperimentsWithPerl

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