Constants

Core.nothingConstant

nothing

The singleton instance of type Nothing, used by convention when there is no value to return (as in a C void function) or when a variable or field holds no value.

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Base.PROGRAM_FILEConstant

PROGRAM_FILE

A string containing the script name passed to Julia from the command line. Note that the script name remains unchanged from within included files. Alternatively see @__FILE__.

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Base.ARGSConstant

ARGS

An array of the command line arguments passed to Julia, as strings.

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Base.C_NULLConstant

C_NULL

The C null pointer constant, sometimes used when calling external code.

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Base.VERSIONConstant

VERSION

A VersionNumber object describing which version of Julia is in use. For details see Version Number Literals.

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Base.LOAD_PATHConstant

LOAD_PATH

An array of paths for using and import statements to consider as project environments or package directories when loading code. See Code Loading.

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Base.Sys.BINDIRConstant

Sys.BINDIR

A string containing the full path to the directory containing the julia executable.

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Base.Sys.CPU_THREADSConstant

Sys.CPU_THREADS

The number of logical CPU cores available in the system, i.e. the number of threads that the CPU can run concurrently. Note that this is not necessarily the number of CPU cores, for example, in the presence of hyper-threading.

See Hwloc.jl or CpuId.jl for extended information, including number of physical cores.

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Base.Sys.WORD_SIZEConstant

Sys.WORD_SIZE

Standard word size on the current machine, in bits.

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Base.Sys.KERNELConstant

Sys.KERNEL

A symbol representing the name of the operating system, as returned by uname of the build configuration.

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Base.Sys.ARCHConstant

Sys.ARCH

A symbol representing the architecture of the build configuration.

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Base.Sys.MACHINEConstant

Sys.MACHINE

A string containing the build triple.

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See also:

• stdin
• stdout
• stderr
• ENV
• ENDIAN_BOM
• Libc.MS_ASYNC
• Libc.MS_INVALIDATE
• Libc.MS_SYNC