Command-line Options

The following is a complete list of command-line switches available when launching julia:

-v, --versionDisplay version information
-h, --helpPrint command-line options (this message).
--project[={<dir>|@.}]Set <dir> as the home project/environment. The default @. option will search through parent directories until a Project.toml or JuliaProject.toml file is found.
-J, --sysimage <file>Start up with the given system image file
-H, --home <dir>Set location of julia executable
--startup-file={yes|no}Load ~/.julia/config/startup.jl
--handle-signals={yes|no}Enable or disable Julia's default signal handlers
--sysimage-native-code={yes|no}Use native code from system image if available
--compiled-modules={yes|no}Enable or disable incremental precompilation of modules
-e, --eval <expr>Evaluate <expr>
-E, --print <expr>Evaluate <expr> and display the result
-L, --load <file>Load <file> immediately on all processors
-t, --threads {N|auto}Enable N threads; auto currently sets N to the number of local CPU threads but this might change in the future
-p, --procs {N|auto}Integer value N launches N additional local worker processes; auto launches as many workers as the number of local CPU threads (logical cores)
--machine-file <file>Run processes on hosts listed in <file>
-iInteractive mode; REPL runs and isinteractive() is true
-q, --quietQuiet startup: no banner, suppress REPL warnings
--banner={yes|no|auto}Enable or disable startup banner
--color={yes|no|auto}Enable or disable color text
--history-file={yes|no}Load or save history
--depwarn={yes|no|error}Enable or disable syntax and method deprecation warnings (error turns warnings into errors)
--warn-overwrite={yes|no}Enable or disable method overwrite warnings
-C, --cpu-target <target>Limit usage of CPU features up to <target>; set to help to see the available options
-O, --optimize={0,1,2,3}Set the optimization level (default level is 2 if unspecified or 3 if used without a level)
--min-optlevel={0,1,2,3}Set the lower bound on per-module optimization (default is 0)
-g, -g <level>Enable / Set the level of debug info generation (default level is 1 if unspecified or 2 if used without a level)
--inline={yes|no}Control whether inlining is permitted, including overriding @inline declarations
--check-bounds={yes|no}Emit bounds checks always or never (ignoring declarations)
--math-mode={ieee,fast}Disallow or enable unsafe floating point optimizations (overrides @fastmath declaration)
--code-coverage={none|user|all}Count executions of source lines
--code-coverageequivalent to --code-coverage=user
--track-allocation={none|user|all}Count bytes allocated by each source line
--track-allocationequivalent to --track-allocation=user
Julia 1.1

In Julia 1.0, the default --project=@. option did not search up from the root directory of a Git repository for the Project.toml file. From Julia 1.1 forward, it does.