[rancid] minor change to handle nexus 4000s

Lee ler762 at gmail.com
Mon Jul 18 19:43:48 UTC 2011

The Nexus 4000s don't support the 'show environment power' command, so
nxrancid doesn't collect the config.  What works for me is to change
ShowEnvPower to return 1 instead of -1 for /\% Invalid command at /

I also added a 'next if (/^\s*\^\s*$/);' so it doesn't add a
!Env:                                 ^
line in the saved config file


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