C:\>reg compare /?
REG COMPARE KeyName1 KeyName2 [/v ValueName | /ve] [Output] [/s]
Machine Name of remote machine - omitting defaults to the current machine.
Only HKLM and HKU are available on remote machines.
If FullKey2 is not specified, FullKey2 is the same as FullKey1.
ROOTKEY [ HKLM | HKCU | HKCR | HKU | HKCC ]
SubKey The full name of a registry key under the selected ROOTKEY.
ValueName The value name, under the selected Key, to compare.
When omitted, all values under the Key are compared.
/ve compare the value of empty value name (Default).
/s Compare all subkeys and values.
Output [/oa | /od | /os | /on]
When omitted, output only differences.
/oa Output all of differences and matches.
/od Output only differences.
/os Output only matches.
/on No output.
0 - Successful, the result compared is identical
1 - Failed
2 - Successful, the result compared is different
The symbols at the front of each outputted line are defined as:
= means FullKey1 data is equal to FullKey2 data
< refers to FullKey1 data and is different than FullKey2 data
> refers to FullKey2 data and is different than Fullkey1 data
REG COMPARE HKLM\Software\MyCo\MyApp HKLM\Software\MyCo\SaveMyApp
Compares all values under the key MyApp with SaveMyApp
REG COMPARE HKLM\Software\MyCo HKLM\Software\MyCo1 /v Version
Compares the value Version under the key MyCo and MyCo1
REG COMPARE \\ZODIAC\HKLM\Software\MyCo \\. /s
Compares all subkeys and values under HKLM\Software\MyCo on ZODIAC
with the same key on the current machineDisclaimer: Taken from a Win7 box.
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