This command checks the /usr directory tree to see whether files or directories have been added, removed, or changed in size since the last fresh installation or upgrade and shows the results.
file check [detection-size-kb]
Specifies the minimum file size change that is required for the command to display the file as changed.
Default value: 100 KB.
The command notifies you about a possible impact to system performance and asks you whether you want to continue. The display includes both deleted and new files.
Because this command can affect system performance, Cisco recommends that you run the command during off-peak hours.
Allowed during upgrade: No