Cpanel /scripts/restorepkg in detail

restorepkg [--force] [--skipres] [--override] [--ip=(y|n|Custom IP)] -- [cpuser|/path/to/cpuser-file]

/scripts/restorepkg --force xxxxxxx

--force
If there's one thing I advise, it's to never use this flag unless you've exhausted normal means of restoring the account. Even then, I'd prefer you contact cPanel support instead so we can figure out what's going on. This option essentially instructs restorepkg to disregard all logic that we put in place to prevent conflicts when an account is being restored.

If the backup you're restoring does contain actual conflicts (domains owned by other users for example), then this sets you up for a world of hurt and unexpected behavior. I see all too often where a sysadmin has forced an account to be restored that conflicts with already existing accounts onto a box.

It does not terminate the account first; it just "shoe horn" restores it on top. The intention of this feature is if you're trying to reduce downtime or are trying to keep 'new' files (like email) that otherwise don't exist in the backup you're restoring from.

But, personally, I would never use --force on my own personal box just for the peace of mind. I'd perform a clean terminate/restore of an account and rest assured that our restorepkg logic has guaranteed me that there are no conflicts.

--skipres
This stands for "Skip Reseller Privileges". Pretty self-explanatory. Using this option will ensure that reseller privileges are NOT restored (if the account had them, that is). If it's not a reseller, this argument effectively does nothing.

--override
This allows you to override the stock cPanel restorepkg code with your own custom written restorepkg logic if you've written some.
Stock Code: /usr/local/cpanel/Whostmgr/Transfers.pm

If you desire to create your own customized version, you would place it at:
Override location: /var/cpanel/lib/Whostmgr/Transfers.pm

Then, when you use "--override" it will call upon the override location code in lieu of the stock code. Note that if you don't have an override setup at that location, the "--override" argument effectively does nothing at all.

--ip=(y|n|Custom IP)
Pretty much self-explanatory.
--ip=y
^-- Allocates the next available IP in the IP Pool to the account upon restore. If none available, uses shared IP.
--ip=n
^-- The same as leaving this flag absent. The account will restore using the shared IP of the box.
--ip=123.123.123.123 (Or any other valid IP)
^-- Attempts to allocate the specified IP to the account upon restore. If not available/does not exist, uses shared IP

cpuser|/path/to/cpuser-file
Self-explanitory again.
cpuser
Will search for archive in various common locations to try and automatically identify the backup you're requesting it to restore. If it cannot find it, it will instruct you where it looked and what it was trying to find.
/path/to/cpuser-file
Simply attempts to restore using the archive that the path specifies.