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# OS
Stability: 2 - Stable
Provides a few basic operating-system related utility functions.
Use `require('os')` to access this module.
## os.EOL
A constant defining the appropriate End-of-line marker for the operating
system.
## os.arch()
Returns the operating system CPU architecture. Possible values are `'x64'`,
`'arm'` and `'ia32'`. Returns the value of [`process.arch`][].
## os.cpus()
Returns an array of objects containing information about each CPU/core
installed: model, speed (in MHz), and times (an object containing the number of
milliseconds the CPU/core spent in: user, nice, sys, idle, and irq).
Example inspection of os.cpus:
```js
[ { model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
speed: 2926,
times:
{ user: 252020,
nice: 0,
sys: 30340,
idle: 1070356870,
irq: 0 } },
{ model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
speed: 2926,
times:
{ user: 306960,
nice: 0,
sys: 26980,
idle: 1071569080,
irq: 0 } },
{ model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
speed: 2926,
times:
{ user: 248450,
nice: 0,
sys: 21750,
idle: 1070919370,
irq: 0 } },
{ model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
speed: 2926,
times:
{ user: 256880,
nice: 0,
sys: 19430,
idle: 1070905480,
irq: 20 } },
{ model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
speed: 2926,
times:
{ user: 511580,
nice: 20,
sys: 40900,
idle: 1070842510,
irq: 0 } },
{ model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
speed: 2926,
times:
{ user: 291660,
nice: 0,
sys: 34360,
idle: 1070888000,
irq: 10 } },
{ model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
speed: 2926,
times:
{ user: 308260,
nice: 0,
sys: 55410,
idle: 1071129970,
irq: 880 } },
{ model: 'Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz',
speed: 2926,
times:
{ user: 266450,
nice: 1480,
sys: 34920,
idle: 1072572010,
irq: 30 } } ]
```
Note that since `nice` values are UNIX centric in Windows the `nice` values of
all processors are always 0.
## os.endianness()
Returns the endianness of the CPU. Possible values are `'BE'` for big endian
or `'LE'` for little endian.
## os.freemem()
Returns the amount of free system memory in bytes.
## os.homedir()
Returns the home directory of the current user.
## os.hostname()
Returns the hostname of the operating system.
## os.loadavg()
Returns an array containing the 1, 5, and 15 minute load averages.
The load average is a measure of system activity, calculated by the operating
system and expressed as a fractional number. As a rule of thumb, the load
average should ideally be less than the number of logical CPUs in the system.
The load average is a very UNIX-y concept; there is no real equivalent on
Windows platforms. That is why this function always returns `[0, 0, 0]` on
Windows.
## os.networkInterfaces()
Get a list of network interfaces:
```js
{ lo:
[ { address: '127.0.0.1',
netmask: '255.0.0.0',
family: 'IPv4',
mac: '00:00:00:00:00:00',
internal: true },
{ address: '::1',
netmask: 'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff',
family: 'IPv6',
mac: '00:00:00:00:00:00',
internal: true } ],
eth0:
[ { address: '192.168.1.108',
netmask: '255.255.255.0',
family: 'IPv4',
mac: '01:02:03:0a:0b:0c',
internal: false },
{ address: 'fe80::a00:27ff:fe4e:66a1',
netmask: 'ffff:ffff:ffff:ffff::',
family: 'IPv6',
mac: '01:02:03:0a:0b:0c',
internal: false } ] }
```
Note that due to the underlying implementation this will only return network
interfaces that have been assigned an address.
## os.platform()
Returns the operating system platform. Possible values are `'darwin'`,
`'freebsd'`, `'linux'`, `'sunos'` or `'win32'`. Returns the value of
[`process.platform`][].
## os.release()
Returns the operating system release.
## os.tmpdir()
Returns the operating system's default directory for temporary files.
## os.totalmem()
Returns the total amount of system memory in bytes.
## os.type()
Returns the operating system name. For example `'Linux'` on Linux, `'Darwin'`
on OS X and `'Windows_NT'` on Windows.
## os.uptime()
Returns the system uptime in seconds.
## os.userInfo([options])
* `options` {Object}
* `encoding` {String} Character encoding used to interpret resulting strings.
If `encoding` is set to `'buffer'`, the `username`, `shell`, and `homedir`
values will be `Buffer` instances. (Default: 'utf8')
Returns a subset of the password file entry for the current effective user. The
returned object includes the `username`, `uid`, `gid`, `shell`, and `homedir`.
On Windows, the `uid` and `gid` fields are `-1`, and `shell` is `null`.
The value of `homedir` returned by `userInfo()` comes directly from the
operating system. This differs from the result of `os.homedir()`, which queries
several environment variables for the home directory before falling back to the
operating system response.
[`process.arch`]: process.html#process_process_arch
[`process.platform`]: process.html#process_process_platform
|
