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syncthing.1
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.\" Man page generated from reStructuredText.
.
.TH "SYNCTHING" "1" "April 23, 2017" "v0.14" "Syncthing"
.SH NAME
syncthing \- Syncthing
.
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.SH SYNOPSIS
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
syncthing [\-audit] [\-auditfile=<file|\-|\-\->] [\-browser\-only] [\-generate=<dir>]
[\-gui\-address=<address>] [\-gui\-apikey=<key>] [\-home=<dir>] [\-logfile=<filename>]
[\-logflags=<flags>] [\-no\-browser] [\-no\-console] [\-no\-restart] [\-paths] [\-paused]
[\-reset\-database] [\-reset\-deltas] [\-upgrade] [\-upgrade\-check] [\-upgrade\-to=<url>]
[\-verbose] [\-version]
.ft P
.fi
.UNINDENT
.UNINDENT
.SH DESCRIPTION
.sp
Syncthing is an application that lets you synchronize your files across multiple
devices. This means the creation, modification or deletion of files on one
machine will automatically be replicated to your other devices. We believe your
data is your data alone and you deserve to choose where it is stored. Therefore
Syncthing does not upload your data to the cloud but exchanges your data across
your machines as soon as they are online at the same time.
.SH OPTIONS
.INDENT 0.0
.TP
.B \-audit
Write events to timestamped file \fBaudit\-YYYYMMDD\-HHMMSS.log\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-auditfile=<file|\-|\-\->
Use specified file or stream (\fB"\-"\fP for stdout, \fB"\-\-"\fP for stderr) for audit events, rather than the timestamped default file name.
.UNINDENT
.INDENT 0.0
.TP
.B \-generate=<dir>
Generate key and config in specified dir, then exit.
.UNINDENT
.INDENT 0.0
.TP
.B \-gui\-address=<address>
Override GUI listen address.
.UNINDENT
.INDENT 0.0
.TP
.B \-home=<dir>
Set configuration directory. The default configuration directory is
\fB$HOME/.config/syncthing\fP (Unix\-like), \fB$HOME/Library/Application Support/Syncthing\fP (Mac) and \fB%LOCALAPPDATA%\eSyncthing\fP (Windows).
.UNINDENT
.INDENT 0.0
.TP
.B \-logfile=<filename>
Set destination filename for logging (use \fB"\-"\fP for stdout, which is the default option).
.UNINDENT
.INDENT 0.0
.TP
.B \-logflags=<flags>
Select information in log line prefix, default 2. The \fB\-logflags\fP value is
a sum of the following:
.INDENT 7.0
.IP \(bu 2
1: Date
.IP \(bu 2
2: Time
.IP \(bu 2
4: Microsecond time
.IP \(bu 2
8: Long filename
.IP \(bu 2
16: Short filename
.UNINDENT
.sp
To prefix each log line with date and time, set \fB\-logflags=3\fP (1 + 2 from
above). The value 0 is used to disable all of the above. The default is to
show time only (2).
.UNINDENT
.INDENT 0.0
.TP
.B \-no\-browser
Do not start a browser.
.UNINDENT
.INDENT 0.0
.TP
.B \-no\-console
Hide the console window. (On Windows only)
.UNINDENT
.INDENT 0.0
.TP
.B \-no\-restart
Disable the Syncthing monitor process which handles restarts for some configuration changes, upgrades, crashes and also log file writing (stdout is still written).
.UNINDENT
.INDENT 0.0
.TP
.B \-paths
Print the paths used for configuration, keys, database, GUI overrides, default sync folder and the log file.
.UNINDENT
.INDENT 0.0
.TP
.B \-reset\-database
Reset the database, forcing a full rescan and resync.
.UNINDENT
.INDENT 0.0
.TP
.B \-reset\-deltas
Reset delta index IDs, forcing a full index exchange.
.UNINDENT
.INDENT 0.0
.TP
.B \-upgrade
Perform upgrade.
.UNINDENT
.INDENT 0.0
.TP
.B \-upgrade\-check
Check for available upgrade.
.UNINDENT
.INDENT 0.0
.TP
.B \-upgrade\-to=<url>
Force upgrade directly from specified URL.
.UNINDENT
.INDENT 0.0
.TP
.B \-verbose
Print verbose log output.
.UNINDENT
.INDENT 0.0
.TP
.B \-version
Show version.
.UNINDENT
.SH DEPRECATED OPTIONS
.INDENT 0.0
.TP
.B \-gui\-apikey=<key>
Override GUI API key (deprecated as of v0.13, to be removed in the future \- do not use).
.UNINDENT
.SH EXIT CODES
.INDENT 0.0
.TP
.B 0
Success / Shutdown
.TP
.B 1
Error
.TP
.B 2
Upgrade not available
.TP
.B 3
Restarting
.TP
.B 4
Upgrading
.UNINDENT
.sp
Some of these exit codes are only returned when running without a monitor
process (with environment variable \fBSTNORESTART\fP set). Exit codes over 125 are
usually returned by the shell/binary loader/default signal handler. Exit codes
over 128+N on Unix usually represent the signal which caused the process to
exit. For example, \fB128 + 9 (SIGKILL) = 137\fP\&.
.SH DEVELOPMENT SETTINGS
.sp
The following environment variables modify Syncthing\(aqs behavior in ways that
are mostly useful for developers. Use with care.
If you start Syncthing from within service managers like systemd or supervisor,
path expansion may not be supported.
.INDENT 0.0
.TP
.B STNODEFAULTFOLDER
Don\(aqt create a default folder when starting for the first time. This
variable will be ignored anytime after the first run.
.TP
.B STGUIASSETS
Directory to load GUI assets from. Overrides compiled in assets.
.TP
.B STTRACE
Used to increase the debugging verbosity in specific or all facilities, generally mapping to a Go package. Enabling any of these also enables microsecond timestamps, file names plus line numbers. Enter a comma\-separated string of facilities to trace. \fBsyncthing \-help\fP always outputs an up\-to\-date list. The valid facility strings
are:
.INDENT 7.0
.TP
.B Main and operational facilities:
.INDENT 7.0
.TP
.B main
Main package.
.TP
.B model
The root hub; the largest chunk of the system. File pulling, index transmission and requests for chunks.
.TP
.B config
Configuration loading and saving.
.TP
.B db
The database layer.
.TP
.B scanner
File change detection and hashing.
.TP
.B versioner
File versioning.
.UNINDENT
.TP
.B Networking facilities:
.INDENT 7.0
.TP
.B beacon
Multicast and broadcast discovery packets.
.TP
.B connections
Connection handling.
.TP
.B dialer
Dialing connections.
.TP
.B discover
Remote device discovery requests, replies and registration of devices.
.TP
.B relay
Relay interaction.
.TP
.B protocol
The BEP protocol.
.TP
.B nat
NAT discovery and port mapping.
.TP
.B pmp
NAT\-PMP discovery and port mapping.
.TP
.B upnp
UPnP discovery and port mapping.
.UNINDENT
.TP
.B Other facilities:
.INDENT 7.0
.TP
.B events
Event generation and logging.
.TP
.B http
REST API.
.TP
.B sha256
SHA256 hashing package (this facility currently unused).
.TP
.B stats
Persistent device and folder statistics.
.TP
.B sync
Mutexes. Used for debugging race conditions and deadlocks.
.TP
.B upgrade
Binary upgrades.
.TP
.B all
All of the above.
.UNINDENT
.UNINDENT
.TP
.B STPROFILER
Set to a listen address such as "127.0.0.1:9090" to start the profiler with
HTTP access.
.TP
.B STCPUPROFILE
Write a CPU profile to cpu\-$pid.pprof on exit.
.TP
.B STHEAPPROFILE
Write heap profiles to \fBheap\-$pid\-$timestamp.pprof\fP each time heap usage
increases.
.TP
.B STBLOCKPROFILE
Write block profiles to \fBblock\-$pid\-$timestamp.pprof\fP every 20 seconds.
.TP
.B STPERFSTATS
Write running performance statistics to \fBperf\-$pid.csv\fP\&. Not supported on
Windows.
.TP
.B STDEADLOCK
Used for debugging internal deadlocks. Use only under direction of a
developer.
.TP
.B STDEADLOCKTIMEOUT
Used for debugging internal deadlocks; sets debug sensitivity. Use only
under direction of a developer.
.TP
.B STDEADLOCKTHRESHOLD
Used for debugging internal deadlocks; sets debug sensitivity. Use only
under direction of a developer.
.TP
.B STNORESTART
Equivalent to the \-no\-restart argument. Disable the Syncthing monitor process which handles restarts for some configuration changes, upgrades, crashes and also log file writing (stdout is still written).
.TP
.B STNOUPGRADE
Disable automatic upgrades.
.TP
.B STHASHING
Specify which hashing package to use. Defaults to automatic based on
performance. Specify "minio" (compatibility) or "standard" for the default Go implementation.
.TP
.B GOMAXPROCS
Set the maximum number of CPU cores to use. Defaults to all available CPU
cores.
.TP
.B GOGC
Percentage of heap growth at which to trigger GC. Default is 100. Lower
numbers keep peak memory usage down, at the price of CPU usage
(i.e. performance).
.UNINDENT
.SH SEE ALSO
.sp
\fIsyncthing\-config(5)\fP, \fIsyncthing\-stignore(5)\fP,
\fIsyncthing\-device\-ids(7)\fP, \fIsyncthing\-security(7)\fP,
\fIsyncthing\-networking(7)\fP, \fIsyncthing\-versioning(7)\fP,
\fIsyncthing\-faq(7)\fP
.SH AUTHOR
The Syncthing Authors
.SH COPYRIGHT
2015, The Syncthing Authors
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