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fx - Fuchsia development commands

fx is the entry-point for a set of subcommands that make many tasks related to Fuchsia development easier.

It contains a large number of subcommands. Run fx help to see all the available subcommands. If you use bash or zsh as a shell, source scripts/
to get some auto-completion.

Also see the global options and flags that affect all subcommands.

fx subcommands

Main subcommands

Subcommands that are part of the fx workflow.

Command Category Description
add-update-source Software delivery register dev host as target's update source
args Build manually edit for the current build directory
build Build Run Ninja to build Fuchsia
build-push Software delivery DEPRECATED! build Fuchsia and push to device
cipd Source tree run the cipd command line tool
clean Build clean the current Fuchsia and Zircon build artifacts
clean-build Build clean the build directory and then perform a full build
cmc Build Component manifest compiler
cp Device management copy a file to/from a target device
create Source tree Scaffold new projects
emu Run, inspect and debug start fuchsia in an emulator
emu-remote Other Remotely run emulator
exec Other read the current build config, then exec
fargo Build Fargo is a prototype Fuchsia-specific wrapper around Cargo
fdt Run, inspect and debug run fuchsia devtools
fetch-build-artifacts Build TODO( under construction.
flash Device management flash and, optionally, pave a connected device
flash-remote Other Remotely build, fetch and flash
gen Build run gn gen against the Fuchsia build directories.
get-build-artifacts Internal api DEPRECATED! Renamed to list-build-artifacts
get-build-dir Build print the current fuchsia build directory
get-device Device discovery print the current selected device name
get-device-addr Device discovery print the Fuchsia address of the current selected device
get-src-dir Build print the Fuchsia source directory (checkout root, aka "//")
gn Build meta-build system that generates build files for Ninja
go Build Manage Go source code
goma_auth Build set up authentication for the Goma distributed compilation client
goma_ctl Build control the local Goma distributed compilation client
helpdoc Documentation create markdown docs for fx subcommands
host-tool Run, inspect and debug run a host tool produced by the build
is-package-server-running Software delivery check if the package server is running
jiri Source tree multi-purpose tool for multi-repo development.
jq5 Build Extends the functionality of jq to json5 objects.
jq Other jq is a utility for manipulating JSON on the command-line.
klog Run, inspect and debug listen for kernel logs
list-boards Build list boards available for building
list-build-artifacts Internal api Builds and returns a list of a desired set of build artifacts
list-devices Device discovery list all nearby devices (excluding those on zedboot)
list-packages Build list packages are built
list-products Build list products available for building
list-usb-disks Other list attached usb disks
log Run, inspect and debug listen for logs from the on-device log_listener
merge-package-config Other
metrics Other manage collection of metrics in fx tools
mkzedboot Software delivery make a zedboot USB key
mkzedboot-remote Software delivery make a zedboot USB key
multi Other Run an fx command across multiple build directories.
netaddr Device discovery get the address of a running fuchsia system
netboot Software delivery run bootserver for netbooting
netboot-remote Other Remotely build, fetch and netboot
netls Device discovery list running fuchsia systems on the local network
ninja Build directly run the build system. Don't use for regular workflows.
ninjatrace2json Build Collect Ninja trace information for analysis in chrome://tracing
node-names Device management find other names for the same node
ota Software delivery perform a system OTA on a connected device
pave Software delivery run bootserver for paving
pave-remote Other Remotely build, fetch and pave
pave-zedboot Software delivery run bootserver for paving zedboot
pave-zedboot-remote Other Remotely build, fetch and pave zedboot
push-package Software delivery DEPRECATED! push packages to a device
qemu Run, inspect and debug start fuchsia in qemu with a FVM disk
reboot Device management reboot a target fuchsia system
report-bug Software delivery report a bug for an fx command
run Software delivery build Fuchsia and push to device
run-host-tests Run, inspect and debug DEPRECATED! build and run tests on host
run-netboot Run, inspect and debug start fuchsia in qemu via netboot
run-test Run, inspect and debug DEPRECATED! build a test package and run on target.
run-test-component Run, inspect and debug DEPRECATED! build a test package and run on target.
scp Device management invoke scp with the build ssh config
self-build Build build the minimal host dependencies to run fx main workflows
self-test Other run tests of fx and subcommands
serial Device management attach to a serial console
serve Software delivery start pave and serve-updates in a single command
serve-remote Other serve from a remote workstation
serve-updates Software delivery start the update server and attach to a running fuchsia device
set Build set up a build directory
set-build-dir Build set the default build directory used by other fx commands
set-device Device discovery set the default device to interact with
setup-macos Other register host tools at MacOS Application Firewall
setup-ufw Other setup Linux firewall rules to allow Fuchsia device and emulator traffic.
sftp Device management invoke sftp with the build ssh config
shell Device management start a remote interactive shell in the target device
ssh Device management invoke ssh with the keys from $FUCHSIA_BUILD_DIR/ssh-keys
status Other print relevant information about the developer setup
symbolize Run, inspect and debug symbolize backtraces and program locations provided as input on stdin
syslog Run, inspect and debug DEPRECATED! [deprecated] alias for fx log
test Run, inspect and debug Entry point for all Fuchsia tests (host, target and end-to-end)
unset-device Device discovery unset the default device to interact with
update Software delivery DEPRECATED! [deprecated] alias for fx ota
update-if-in-base Software delivery check if packages are in base and update the device if needed
use Build re-use a previous build directory set up by fx set
vdl Other
vendor Other forward commands to vendor/*/scripts/devshell
wait Device management wait for a shell to become available
zxdb Run, inspect and debug Fuchsia native debugger

Contrib subcommands

Subcommands that have been contributed by project members that have other levels of support, ownership, or both. The OWNERS file in the contrib directory provides a pointer to the member that supports each script.

Command Category Description
bindc Run, inspect and debug run the bind program compiler and debugger
binutils Run, inspect and debug Provides a shortcut to the prebuilt LLVM binutils tools
bisect-rustc Other
blobstats Run, inspect and debug compute some blobfs statistics from the build
bt-snoop-from-snapshot Run, inspect and debug extract a snoop log from a snapshot as pcap formatted data
check-deps Build checks dependency graph in areas
check-licenses Documentation analyze the license state of a given package or directory
clang-tidy Source tree runs clang-tidy on specified files
codesize Run, inspect and debug Code size attribution on binaries from the system image
compdb Build DEPRECATED
component-graph Run, inspect and debug start component graph server to map component topology
component-surveyor Other produce a dump of v1 components in CSV form.
core-tests Run, inspect and debug run zircon core-tests
cpu-stats Run, inspect and debug generate a report of CPU stats from a snapshot
dart-remote-test Run, inspect and debug runs a single remote test target through //scripts/
dart-tunnel Run, inspect and debug forward local ports to Dart VMs on the device.
debug Run, inspect and debug run the debug agent on target and connect to it with zxdb
delta Software delivery compare all built Fuchsia packages with a prior package snapshot
disk-extract-serial-log Run, inspect and debug Extract disk image from serial logs.
exec-host-tests Other
extract_pprof Run, inspect and debug Extract pprof data from inspect.json
extract-zbi Other
ffx Other execute ffx - future fx
fidlcat Run, inspect and debug run fidlcat on given target.
fidldoc Documentation generate documentation for FIDL
fidltags Other generate tags for .fidl files
flutter-attach Run, inspect and debug attach to a running flutter module to enable hot reload and debugging
format-code Source tree runs source formatters on modified files
fuzz Run, inspect and debug run a fuzz test on target a device
gc Software delivery garbage collect packages on the target (reboots!)
gce Other Google Compute Engine commands
gen-cargo Other Runs a Rust helper script inside the fx environment
gen-cargo Source tree generate symlinks to Rust Cargo.toml output files
gerrit-submit Code submission and review Submits chains of CLs to Gerrit
goma Build manage Goma distributed compilation client
grep Source tree print lines in the Fuchsia and Zircon sources matching the given pattern
init-partition-tables Other run bootserver for initializing partition tables
iquery Other
lint Source tree runs source linters on modified files
make-fuchsia-vol Other build a fuchsia persistent disk
make-integration-patch Source tree Creates an integration CL to test other CLs in the global integration commit queue.
mkinstaller Software delivery make a Fuchsia installer image
overnet Run, inspect and debug start an overnet host-pipe to target device
pending-commits Source tree view commits not yet published to global integration
qemu-cipd-ensure Other Generate CIPD files to download the current QEMU package.
regen-goldens Source tree regenerates golden files in the source tree
roll-compiler Other
run-dart-action Run, inspect and debug Run Dart actions (analysis, test, target-test)
run-e2e-tests Run, inspect and debug run e2e tests
run-in-build Run, inspect and debug Run a command in the build directory
run-recovery Run, inspect and debug start Fuchsia System Recovery in qemu
run-zbi-test Run, inspect and debug Run a ZBI test Other
run-zbi-test-remote Run, inspect and debug Remotely build a ZBI test, fetch and run it
rustdoc Other Runs a Rust helper script inside the fx environment
rustdoc Documentation generate documentation for Rust code
rustfmt Other Runs a Rust helper script inside the fx environment
rustfmt Source tree format Rust code
save-package-stats Software delivery take a snapshot of all built Fuchsia packages
screenshot Device management takes a screenshot and copies it to the host
scrutiny Run, inspect and debug An extensible security auditing framework and toolkit for Fuchsia.
set-petal Source tree configure jiri to manage a specific petal
set-relay Other Actuates the state of an external relay by writing a single byte to |tty|.
setup-go Other Set up the checkout for Go development.
setup-usb-ethernet Other Setup udev rules for USB CDC ethernet
show-package Software delivery lists package contents
smoke-test Other Runs a Python helper script inside the fx environment
smoke-test Build Finds and runs tests affected by the current change.
snapshot Run, inspect and debug Obtain and parse a snapshot from a connected target.
sniff Run, inspect and debug packet capture and display tool
symbol-index Build manipulate the symbol-index file
sync-from-stem Source tree sync integration and deps to a state matching fuchsia.git state
traceutil Run, inspect and debug Fuchsia tracing utility
triage Run, inspect and debug generate a report of error conditions
unarchive-package Software delivery unarchive a Fuchsia package archive in FAR format
update-rust-3p-owners Source tree updates OWNERS files for Rust third_party dependencies
update-rustc-third-party Source tree updates rustc_library and rustc_binary third_party dependencies
wipe-partition-tables Other run bootserver for wiping partition tables
zedmon Other run zedmon client