svn help lock
lock: Lock working copy paths or URLs in the repository, so that
no other user can commit changes to them.
usage: lock TARGET...
Use --force to steal the lock from another user or working copy.
Valid options:
--targets arg : pass contents of file ARG as additional args
-m [--message] arg : specify lock comment ARG
-F [--file] arg : read lock comment from file ARG
--force-log : force validity of log message source
--encoding arg : treat value as being in charset encoding ARG
--username arg : specify a username ARG
--password arg : specify a password ARG
--no-auth-cache : do not cache authentication tokens
--non-interactive : do no interactive prompting
--config-dir arg : read user configuration files from directory ARG
--force : force operation to run