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As most Unix tools, Lsyncd will print a synopsis of its command line options when called with --help.
lsyncd --help
lsyncd -help
The two hyphens are redundant for Lsyncd. It has no short one letter options and one hyphen will always result into the same as specifying two.
Also like most Unix tools, --version or -version will let Lsyncd print its version number.
lsyncd -version
Lsyncd 2.1 is designed to be predominantly configured through a config file (see below). The config file can thus be the only command line option.
lsyncd CONFIGFILE
Although for standard use or quick testing it can be cursorily configured by command line options. The following will keep a local source and destination directory in sync using rsync:
lsyncd -rsync /home/USER/src /home/USER/dst
The target can here be anything that Rsync recognizes.
lsyncd -rsync /home/USER/src remotehost:dst
Two (or more) targets are configured by calling -rsync twice (or several times).
lsyncd -rsync /home/USER/src remotehost1:dst -rsync /home/USER/src remotehost2:dst
A disadvantage with Rsync synchronization is that normally directory and file moves result in a deletion of the move origin and a retransfer of the move destination of the wire. However, Lsyncd 2 can use ssh commands to move the directories and files locally on the target. To use this use -rsyncssh followed by the local source directory, the remote host and the target directory there. The REMOTEHOST can include a user like me@remotehost.com.
lsyncd -rsyncssh /home/USER/src REMOTEHOST TARGETDIR
When testing Lsyncd configurations -nodaemon is a pretty handy flag. With this option, Lsyncd will not detach and will not become a daemon. All log messages are additionally to the configured logging facilities printed on the console (stdout and stderr).
lsyncd -nodaemon CONFIGFILE
There is a difference in behaviour when running with -nodaemon. Lsyncd will not change its working directory to /, as it does when becoming a daemon. Thus relative targets like ./target will work with -nodaemon but must be specified to absolute paths to work in daemon mode. The source directories will also be turned into absolute paths by Lsyncd. The reason targets are not resolved to absolute paths while sources are is because Lsyncd itself does not care about the format of the target specifier which can also be remote hosts, rsyncd modules, etc. It is opaquely handed to rsync. It cares about the observed directories though.
New in 2.3.0
To only trigger the initial full sync and not monitor the file system, you can use the -onepass option.
lsyncd -onepass CONFIGFILE
Logging
All log messages are sorted in categories. By default Lsyncd is scarce with log messages. You can turn Lsyncd into a motormouth by specifying -log all.
lsyncd -log all CONFIGFILE
This might easily become too much. A particularly useful category is "Exec" which will log the command lines of all processes Lsyncd spawns.
lsyncd -log Exec CONFIGFILE
When the initial startup sync fails by default Lsyncd will terminate with an error message. It has been designed this way, so configuration failures are visibly reported to a possibly beginning user. However, in production a remote target might be done, but you want Lsyncd to start nevertheless and keep trying to sync to the remote target until it is up.
lsyncd -insist -rsync /home/USER/src remotehost:dst
In production mode it is recommended to have insist on. It can also be specified in the settings{} command in a config file.