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# os
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Stability: 4 - API Frozen
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Provides a few basic operating-system related utility functions.
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Use `require('os')` to access this module.
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## os.tmpdir()
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Returns the operating system's default directory for temp files.
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## os.endianness()
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Returns the endianness of the CPU. Possible values are `"BE"` or `"LE"`.
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## os.hostname()
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Returns the hostname of the operating system.
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## os.type()
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Returns the operating system name.
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## os.platform()
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Returns the operating system platform.
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## os.arch()
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Returns the operating system CPU architecture.
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## os.release()
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Returns the operating system release.
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## os.uptime()
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Returns the system uptime in seconds.
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## os.loadavg()
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Returns an array containing the 1, 5, and 15 minute load averages.
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This function always return `[0, 0, 0]` on Windows.
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## os.totalmem()
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Returns the total amount of system memory in bytes.
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## os.freemem()
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Returns the amount of free system memory in bytes.
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## os.cpus()
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Returns an array of objects containing information about each CPU/core
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installed: model, speed (in MHz), and times (an object containing the number of
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milliseconds the CPU/core spent in: user, nice, sys, idle, and irq).
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Example inspection of os.cpus:
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[ { model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
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speed: 2926,
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times:
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{ user: 252020,
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nice: 0,
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sys: 30340,
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idle: 1070356870,
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irq: 0 } },
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{ model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
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speed: 2926,
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times:
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{ user: 306960,
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nice: 0,
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sys: 26980,
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idle: 1071569080,
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irq: 0 } },
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{ model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
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speed: 2926,
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times:
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{ user: 248450,
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nice: 0,
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sys: 21750,
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idle: 1070919370,
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irq: 0 } },
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{ model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
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speed: 2926,
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times:
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{ user: 256880,
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nice: 0,
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sys: 19430,
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idle: 1070905480,
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irq: 20 } },
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{ model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
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speed: 2926,
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times:
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{ user: 511580,
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nice: 20,
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sys: 40900,
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idle: 1070842510,
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irq: 0 } },
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{ model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
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speed: 2926,
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times:
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{ user: 291660,
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nice: 0,
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sys: 34360,
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idle: 1070888000,
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irq: 10 } },
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{ model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
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speed: 2926,
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times:
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{ user: 308260,
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nice: 0,
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sys: 55410,
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idle: 1071129970,
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irq: 880 } },
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{ model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
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speed: 2926,
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times:
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{ user: 266450,
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nice: 1480,
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sys: 34920,
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idle: 1072572010,
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irq: 30 } } ]
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## os.networkInterfaces()
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Get a list of network interfaces:
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{ lo0:
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[ { address: '::1', family: 'IPv6', internal: true },
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{ address: 'fe80::1', family: 'IPv6', internal: true },
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{ address: '127.0.0.1', family: 'IPv4', internal: true } ],
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en1:
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[ { address: 'fe80::cabc:c8ff:feef:f996', family: 'IPv6',
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internal: false },
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{ address: '10.0.1.123', family: 'IPv4', internal: false } ],
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vmnet1: [ { address: '10.99.99.254', family: 'IPv4', internal: false } ],
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vmnet8: [ { address: '10.88.88.1', family: 'IPv4', internal: false } ],
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ppp0: [ { address: '10.2.0.231', family: 'IPv4', internal: false } ] }
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## os.EOL
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A constant defining the appropriate End-of-line marker for the operating system.
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