The "patch" command:

Usage: fossil patch SUBCOMMAND ?ARGS ..?

This command is used to create, view, and apply Fossil binary patches. A Fossil binary patch is a single (binary) file that captures all of the uncommitted changes of a check-out. Use Fossil binary patches to transfer proposed or incomplete changes between machines for testing or analysis.

fossil patch create [DIRECTORY] FILENAME

Create a new binary patch in FILENAME that captures all uncommitted changes in the check-out at DIRECTORY, or the current directory if DIRECTORY is omitted. If FILENAME is "-" then the binary patch is written to standard output.

-f|--force
Overwrite an existing patch with the same name.

fossil patch apply [DIRECTORY] FILENAME

Apply the changes in FILENAME to the check-out at DIRECTORY, or in the current directory if DIRECTORY is omitted. Options:

-f|--force
Apply the patch even though there are unsaved changes in the current check-out. Unsaved changes are reverted and permanently lost.
-n|--dryrun
Do nothing, but print what would have happened.
-v|--verbose
Extra output explaining what happens.

fossil patch diff [DIRECTORY] FILENAME

Show a human-readable diff for the patch. All the usual diff flags described at "fossil help diff" apply. In addition:

-f|--force
Continue trying to perform the diff even if baseline information is missing from the current repository

fossil patch push REMOTE-CHECKOUT

Create a patch for the current check-out, transfer that patch to a remote machine (using ssh) and apply the patch there. The REMOTE-CHECKOUT is in one of the following formats:

DIRECTORY
HOST:DIRECTORY
USER@HOST:DIRECTORY
Command-line options:

-f|--force
Apply the patch even though there are unsaved changes in the current check-out. Unsaved changes will be reverted and then the patch is applied.
--fossilcmd EXE
Name of the "fossil" executable on the remote
-n|--dryrun
Do nothing, but print what would have happened.
-v|--verbose
Extra output explaining what happens.

fossil patch pull REMOTE-CHECKOUT

Like "fossil patch push" except that the transfer is from remote to local. All the same command-line options apply.

fossil patch view FILENAME

View a summary of the changes in the binary patch FILENAME. Use "fossil patch diff" for detailed patch content.

-v|--verbose
Show extra detail about the patch.