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v2.0.13
man/syncthing.1
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Syncthing Release Automation
chore(gui, man, authors): update docs, translations, and contributors
08 дек 2025, 07:02
08 дек 2025, 07:02
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.\" Man page generated from reStructuredText. . . .nr rst2man-indent-level 0 . .de1 rstReportMargin \\$1 \\n[an-margin] level \\n[rst2man-indent-level] level margin: \\n[rst2man-indent\\n[rst2man-indent-level]] - \\n[rst2man-indent0] \\n[rst2man-indent1] \\n[rst2man-indent2] .. .de1 INDENT .\" .rstReportMargin pre: . RS \\$1 . nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin] . nr rst2man-indent-level +1 .\" .rstReportMargin post: .. .de UNINDENT . RE .\" indent \\n[an-margin] .\" old: \\n[rst2man-indent\\n[rst2man-indent-level]] .nr rst2man-indent-level -1 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]] .in \\n[rst2man-indent\\n[rst2man-indent-level]]u .. .TH "SYNCTHING" "1" "Dec 07, 2025" "v2.0.0" "Syncthing" .SH NAME syncthing \- Syncthing .SH SYNOPSIS .INDENT 0.0 .INDENT 3.5 .sp .EX syncthing [serve] [\-\-home=<dir> | \-\-config=<dir> \-\-data=<dir>] [\-\-allow\-newer\-config] [\-\-audit] [\-\-auditfile=<file|\-|\-\->] [\-\-db\-maintenance\-interval=<interval>] [\-\-db\-delete\-retention\-interval=<interval>] [\-\-gui\-address=<address>] [\-\-gui\-apikey=<key>] [\-\-log\-level=<level>] [\-\-log\-file=<filename>] [\-\-log\-max\-old\-files=<num>] [\-\-log\-max\-size=<num>] [\-\-log\-format\-timestamp=<format>] [\-\-no\-log\-format\-level\-string] [\-\-log\-format\-level\-syslog] [\-\-no\-browser] [\-\-no\-console] [\-\-no\-port\-probing] [\-\-no\-restart] [\-\-no\-upgrade] [\-\-paused] [\-\-unpaused] [\-\-version] [\-\-help] [\-\-debug\-*] syncthing cli [\-\-home=<dir> | \-\-config=<dir> \-\-data=<dir>] [\-\-gui\-address=<address>] [\-\-gui\-apikey=<key>] [\-\-help] <command> [command options...] [arguments...] syncthing browser [\-\-home=<dir> | \-\-config=<dir> \-\-data=<dir>] [\-\-help] syncthing decrypt (\-\-to=<dir> | \-\-verify\-only) [\-\-home=<dir> | \-\-config=<dir> \-\-data=<dir>] [\-\-password=<pw>] [\-\-folder\-id=<id>] [\-\-token\-path=<file>] [\-\-continue] [\-\-verbose] [\-\-help] <path> syncthing device\-id [\-\-home=<dir> | \-\-config=<dir> \-\-data=<dir>] [\-\-help] syncthing generate [\-\-home=<dir> | \-\-config=<dir> \-\-data=<dir>] [\-\-gui\-user=<username>] [\-\-gui\-password=<password|\->] [\-\-no\-port\-probing] [\-\-help] syncthing paths [\-\-home=<dir> | \-\-config=<dir> \-\-data=<dir>] [\-\-help] syncthing upgrade [\-\-home=<dir> | \-\-config=<dir> \-\-data=<dir>] [\-\-check\-only] [\-\-from=<url>] [\-\-help] syncthing version [\-\-home=<dir> | \-\-config=<dir> \-\-data=<dir>] [\-\-help] syncthing debug <command> [\-\-home=<dir> | \-\-config=<dir> \-\-data=<dir>] [\-\-help] .EE .UNINDENT .UNINDENT .SH DESCRIPTION .sp Syncthing lets you synchronize your files bidirectionally 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. .sp The \fBsyncthing\fP core application is a command\-line program which usually runs in the background and handles the synchronization. It provides a built\-in, HTML and JavaScript based user interface to be controlled from a web browser. This frontend communicates with the core application through some HTTP APIs, which other apps like graphical system integration helpers can use as well, for greatest flexibility. A link to reach the GUI and API is printed among the first few log messages. .SH COMMON OPTIONS .INDENT 0.0 .TP .B \-\-home=<dir>, \-H <dir> ($STHOMEDIR) Set common configuration and data directory. The default configuration directory is \fB$XDG_STATE_HOME/syncthing\fP or \fB$HOME/.local/state/syncthing\fP (Unix\-like), \fB$HOME/Library/Application Support/Syncthing\fP (Mac) and \fB%LOCALAPPDATA%\eSyncthing\fP (Windows). .UNINDENT .INDENT 0.0 .TP .B \-\-config=<dir>, \-C <dir> ($STCONFDIR) Set configuration directory. Alternative to \fB\-\-home\fP and must be used together with \fB\-\-data\fP\&. .UNINDENT .INDENT 0.0 .TP .B \-\-data=<dir>, \-D <dir> ($STDATADIR) Set data (e.g. database) directory. Alternative to \fB\-\-home\fP and must be used together with \fB\-\-config\fP\&. .UNINDENT .INDENT 0.0 .TP .B \-\-help, \-h Show help text about command line usage. Context\-sensitive depending on the given subcommand. .UNINDENT .SH SERVE OPTIONS .INDENT 0.0 .TP .B \-\-allow\-newer\-config ($STALLOWNEWERCONFIG) Try loading a config file written by a newer program version, instead of failing immediately. .UNINDENT .INDENT 0.0 .TP .B \-\-audit ($STAUDIT) Write events to timestamped file \fBaudit\-YYYYMMDD\-HHMMSS.log\fP\&. .UNINDENT .INDENT 0.0 .TP .B \-\-auditfile=<file|\-|\-\-> ($STAUDITFILE) Use specified file or stream (\fB\(dq\-\(dq\fP for stdout, \fB\(dq\-\-\(dq\fP for stderr) for audit events, rather than the timestamped default file name. .UNINDENT .INDENT 0.0 .TP .B \-\-db\-maintenance\-interval=<interval> ($STDBMAINTENANCEINTERVAL) Database maintenance interval – internal database maintenance routines run this often. The format is that of a Go duration string (see \X'tty: link https://pkg.go.dev/time#ParseDuration'\fI\%https://pkg.go.dev/time#ParseDuration\fP\X'tty: link'). .UNINDENT .INDENT 0.0 .TP .B \-\-db\-delete\-retention\-interval=<interval> ($STDBDELETERETENTIONINTERVAL) Database deleted item retention interval – deleted items are forgotten from the database after this interval. The format is that of a Go duration string (see \X'tty: link https://pkg.go.dev/time#ParseDuration'\fI\%https://pkg.go.dev/time#ParseDuration\fP\X'tty: link'). .UNINDENT .INDENT 0.0 .TP .B \-\-gui\-address=<address> ($STGUIADDRESS) Override GUI listen address. Set this to an address (\fB0.0.0.0:8384\fP) or a URL (\fBhttp://0.0.0.0:8384\fP). Supported schemes are \fBhttp\fP for plain HTTP, \fBhttps\fP for HTTP over TLS, \fBunix\fP for plain Unix sockets or \fBunixs\fP for TLS over Unix sockets. A Unix socket could look like this: \fBunix:///run/syncthing/syncthing.socket\fP (notice the three slashes: two as part of the URL structure, one to specify an absolute path). .UNINDENT .INDENT 0.0 .TP .B \-\-gui\-apikey=<string> ($STGUIAPIKEY) Override the API key needed to access the GUI / REST API. .UNINDENT .INDENT 0.0 .TP .B \-\-log\-file=<filename> ($STLOGFILE) Set destination filename for logging (use \fB\(dq\-\(dq\fP for stdout, which is the default option). .UNINDENT .INDENT 0.0 .TP .B \-\-log\-level=<level> ($STLOGLEVEL) Set the log level for all packages. Valid levels are DEBUG, INFO, WARN, and ERROR. .UNINDENT .INDENT 0.0 .TP .B \-\-log\-max\-old\-files=<num> ($STLOGMAXOLDFILES) Number of old files to keep (zero to keep only current). Applies only when log rotation is enabled through \fB\-\-log\-max\-size\fP\&. .UNINDENT .INDENT 0.0 .TP .B \-\-log\-max\-size=<num> ($STLOGMAXSIZE) Maximum size in bytes of any log file (zero to disable log rotation). .UNINDENT .INDENT 0.0 .TP .B \-\-log\-format\-timestamp=<format> ($STLOGFORMATTIMESTAMP) Format for timestamp, set to empty to disable timestamps. The format is that of the Go time formatter (see \X'tty: link https://pkg.go.dev/time#Layout'\fI\%https://pkg.go.dev/time#Layout\fP\X'tty: link'). .UNINDENT .INDENT 0.0 .TP .B \-\-[no\-]log\-format\-level\-string ($STLOGFORMATLEVELSTRING) Whether to include level string (e.g. “INF”) in log line. .UNINDENT .INDENT 0.0 .TP .B \-\-[no\-]log\-format\-level\-syslog ($STLOGFORMATLEVELSYSLOG) Whether to include level as syslog prefix (e.g. “<6>”) in log line. .UNINDENT .INDENT 0.0 .TP .B \-\-no\-browser ($STNOBROWSER) Do not start a browser. .UNINDENT .INDENT 0.0 .TP .B \-\-no\-console ($STNOCONSOLE) Hide the console window. (On Windows only) .UNINDENT .INDENT 0.0 .TP .B \-\-no\-port\-probing ($STNOPORTPROBING) Don’t try to find unused random ports for the GUI and listen address when generating an initial configuration / starting for the first time. .UNINDENT .INDENT 0.0 .TP .B \-\-no\-restart ($STNORESTART) Do not restart Syncthing when it exits. The monitor process will still run to handle crashes and writing to logfiles (if configured to). .UNINDENT .INDENT 0.0 .TP .B \-\-no\-upgrade ($STNOUPGRADE) Disable automatic upgrades. .UNINDENT .INDENT 0.0 .TP .B \-\-paused ($STPAUSED) Start with all devices and folders paused. .UNINDENT .INDENT 0.0 .TP .B \-\-unpaused ($STUNPAUSED) Start with all devices and folders unpaused. .UNINDENT .INDENT 0.0 .TP .B \-\-version Show the current version information, then exit. .UNINDENT .INDENT 0.0 .TP .B \-\-debug\-* Several debug options exist. See \fBsyncthing serve \-\-help\fP for the flags that apply to your version. .UNINDENT .SH DECRYPT OPTIONS .INDENT 0.0 .TP .B \-\-to=<dir> Destination directory where files should be stored after decryption. .UNINDENT .INDENT 0.0 .TP .B \-\-verify\-only Don’t write decrypted files to disk (but verify plaintext hashes). .UNINDENT .INDENT 0.0 .TP .B \-\-password=<pw> ($FOLDER_PASSWORD) Folder password for decryption / verification. Can be passed through the \fBFOLDER_PASSWORD\fP environment variable instead to avoid recording in a shell’s history buffer or sniffing from the running processes list. .UNINDENT .INDENT 0.0 .TP .B \-\-folder\-id=<id> Folder ID of the encrypted folder, if it cannot be determined automatically. .UNINDENT .INDENT 0.0 .TP .B \-\-token\-path=<file> Path to the token file within the folder (used to determine folder ID). .UNINDENT .INDENT 0.0 .TP .B \-\-continue Continue processing next file in case of error, instead of aborting. .UNINDENT .SH GENERATE OPTIONS .INDENT 0.0 .TP .B \-\-gui\-password=<password|\-> Specify new GUI authentication password, to update the config file. Read from the standard input stream if only a single dash (\fB\-\fP) is given. A plaintext password is hashed before writing to the config file, but an already bcrypt\-hashed input is stored verbatim. As a special case, giving the existing password hash as password will leave it untouched. .UNINDENT .INDENT 0.0 .TP .B \-\-gui\-user=<username> Specify new GUI authentication user name, to update the config file. .UNINDENT .SH UPGRADE OPTIONS .INDENT 0.0 .TP .B \-\-check\-only Do not upgrade, only indicate whether an upgrade is available. .UNINDENT .INDENT 0.0 .TP .B \-\-from=<url> Upgrade to the Syncthing version available from loading the package at the given URL. .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 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 SUBCOMMANDS .sp The command line syntax supports different modes of operation through several subcommands, specified as the first argument. If omitted, the default \fBserve\fP is assumed. .sp The initial setup of a device ID and default configuration can be called explicitly with the \fBgenerate\fP subcommand. It can also update the configured GUI authentication credentials, without going through the REST API. An existing device certificate is left untouched. If the configuration file already exists, it is validated and updated to the latest configuration schema, including adding default values for any new options. .sp The \fBdecrypt\fP subcommand is used in conjunction with untrusted (encrypted) devices, see the relevant section on \fI\%decryption\fP for details. It does not depend on Syncthing to be running, but works on offline data. .sp To work with the REST API for debugging or automating things in Syncthing, the \fBcli\fP subcommand provides easy access to individual features. It basically saves the hassle of handling HTTP connections and API authentication. .sp The available subcommands are grouped into several nested hierarchies and some parts dynamically generated from the running Syncthing instance. On every level, the \fB\-\-help\fP option lists the available properties, actions and commands for the user to discover interactively. The top\-level groups are: .INDENT 0.0 .TP .B config Access the live configuration in a running instance over the REST API to retrieve (get) or update (set) values in a fine\-grained way. The hierarchy is based on the same structure as used in the JSON / XML representations. .TP .B show Show system properties and status of a running instance. The output is passed on directly from the REST API response and therefore requires parsing JSON format. .TP .B operations Control the overall program operation such as restarting or handling upgrades, as well as triggering some actions on a per\-folder basis. Can also configure the default ignore patterns from a plain text ignore file. .TP .B errors Examine pending error conditions that need attention from the user, or acknowledge (clear) them. .TP .B debug Various tools to aid in diagnosing problems or collection information for bug reports. Some of these commands access the database directly and can therefore only work when Syncthing is not running. .TP .B \fB\-\fP (a single dash) Reads subsequent commands from the standard input stream, without needing to call the \fBsyncthing cli\fP command over and over. Exits on any invalid command or when EOF (end\-of\-file) is received. .UNINDENT .SH PROXIES .sp Syncthing can use a SOCKS, HTTP, or HTTPS proxy to talk to the outside world. The proxy is used for outgoing connections only \- it is not possible to accept incoming connections through the proxy. The proxy is configured through the environment variable \fBall_proxy\fP\&. Somewhat unusually, this variable must be named in lower case \- it is not “ALL_PROXY”. For example: .INDENT 0.0 .INDENT 3.5 .sp .EX $ export all_proxy=socks://192.0.2.42:8081 .EE .UNINDENT .UNINDENT .SH DEVELOPMENT SETTINGS .sp The following environment variables modify Syncthing’s 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 STTRACE Used to increase the debugging verbosity in specific facilities, generally mapping to a Go package. Enter a comma\-separated string of facilities to trace: \fBapi,beacon\fP\&. Optionally, a log level can be given per facility to specify something other than DEBUG: \fBapi:WARN,beacon:ERROR\fP, potentially overriding a global \fB\-\-log\-level\fP adjustment. .sp The valid facility strings are listed below; additionally, \fBsyncthing serve \-\-help\fP always outputs the most up\-to\-date list. .INDENT 7.0 .TP .B api REST API .TP .B beacon Multicast and broadcast discovery .TP .B config Configuration loading and saving .TP .B connections Connection handling .TP .B db/sqlite SQLite database .TP .B dialer Dialing connections .TP .B discover Remote device discovery .TP .B events Event generation and logging .TP .B fs Filesystem access .TP .B main Main package .TP .B model The root hub .TP .B nat NAT discovery and port mapping .TP .B pmp NAT\-PMP discovery and port mapping .TP .B protocol The BEP protocol .TP .B relay/client Relay client .TP .B scanner File change detection and hashing .TP .B stun STUN functionality .TP .B syncthing Main run facility .TP .B upgrade Binary upgrades .TP .B upnp UPnP discovery and port mapping .TP .B ur Usage reporting .TP .B versioner File versioning .TP .B watchaggregator Filesystem event watcher .UNINDENT .TP .B STLOCKTHRESHOLD Used for debugging internal deadlocks; sets debug sensitivity. Use only under direction of a developer. .TP .B STVERSIONEXTRA Add extra information to the version string in logs and the version line in the GUI. Can be set to the name of a wrapper or tool controlling syncthing to communicate this to the end user. .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). .TP .B LOGGER_DISCARD Hack to completely disable logging, for example when running benchmarks. Set to any nonempty value to use it. .UNINDENT .SH SEE ALSO .sp \fBsyncthing\-config(5)\fP, \fBsyncthing\-stignore(5)\fP, \fBsyncthing\-device\-ids(7)\fP, \fBsyncthing\-security(7)\fP, \fBsyncthing\-networking(7)\fP, \fBsyncthing\-versioning(7)\fP, \fBsyncthing\-faq(7)\fP .SH AUTHOR The Syncthing Authors .SH COPYRIGHT 2014-2025, The Syncthing Authors .\" Generated by docutils manpage writer. .