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*-l*[=_mode_]::
Use exclusive BSD lock for device or file it operates. The optional argument
- _mode_ can be _yes_, _no_ (or 1 and 0) or _nonblock_. If the \fImode\fR
+ _mode_ can be _yes_, _no_ (or 1 and 0) or _nonblock_. If the _mode_
argument is omitted, it defaults to _"yes"_. This option overwrites
environment variable *$LOCK_BLOCK_DEVICE*. The default is not to use any
lock at all, but it's recommended to avoid collisions with udevd or other