+.SH COMMON COMMANDS
+Every Open vSwitch daemon supports a common set of commands, which are
+documented in this section.
+.
+.SS GENERAL COMMANDS
+These commands display daemon-specific commands and the running version.
+Note that these commands are different from the \fB\-\-help\fR and
+\fB\-\-version\fR options that return information about the
+\fBovs\-appctl\fR utility itself.
+.
+.IP "\fBhelp\fR"
+Lists the commands supported by the target.
+.
+.IP "\fBversion\fR"
+Displays the version and compilation date of the target.
+.
+.SS LOGGING COMMANDS
+Open vSwitch has several log levels. The highest-severity log level is:
+.
+.IP "\fBoff\fR"
+No message is ever logged at this level, so setting a logging
+facility's log level to \fBoff\fR disables logging to that facility.
+.
+.PP
+The following log levels, in order of descending severity, are
+available:
+.
+.IP "\fBemer\fR"
+A major failure forced a process to abort.
+.IP "\fBerr\fR"
+A high-level operation or a subsystem failed. Attention is
+warranted.
+.IP "\fBwarn\fR"
+A low-level operation failed, but higher-level subsystems may be able
+to recover.
+.IP "\fBinfo\fR"
+Information that may be useful in retrospect when investigating
+a problem.
+.IP "\fBdbg\fR"
+Information useful only to someone with intricate knowledge of the
+system, or that would commonly cause too-voluminous log output. Log
+messages at this level are not logged by default.