doc: format Unix consistently

Update the API docs to always spell as Unix.

PR-URL: https://github.com/nodejs/node/pull/28576
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

doc/api/child_process.md

@@ -146,7 +146,7 @@ changes:
   * `encoding` {string} **Default:** `'utf8'`
   * `shell` {string} Shell to execute the command with. See
     [Shell Requirements][] and [Default Windows Shell][]. **Default:**
-    `'/bin/sh'` on UNIX, `process.env.ComSpec` on Windows.
+    `'/bin/sh'` on Unix, `process.env.ComSpec` on Windows.
   * `timeout` {number} **Default:** `0`
   * `maxBuffer` {number} Largest amount of data in bytes allowed on stdout or
     stderr. If exceeded, the child process is terminated and any output is
@@ -260,7 +260,7 @@ changes:
   * `windowsVerbatimArguments` {boolean} No quoting or escaping of arguments is
     done on Windows. Ignored on Unix. **Default:** `false`.
   * `shell` {boolean|string} If `true`, runs `command` inside of a shell. Uses
-    `'/bin/sh'` on UNIX, and `process.env.ComSpec` on Windows. A different
+    `'/bin/sh'` on Unix, and `process.env.ComSpec` on Windows. A different
     shell can be specified as a string. See [Shell Requirements][] and
     [Default Windows Shell][]. **Default:** `false` (no shell).
 * `callback` {Function} Called with the output when process terminates.
@@ -411,7 +411,7 @@ changes:
   * `uid` {number} Sets the user identity of the process (see setuid(2)).
   * `gid` {number} Sets the group identity of the process (see setgid(2)).
   * `shell` {boolean|string} If `true`, runs `command` inside of a shell. Uses
-    `'/bin/sh'` on UNIX, and `process.env.ComSpec` on Windows. A different
+    `'/bin/sh'` on Unix, and `process.env.ComSpec` on Windows. A different
     shell can be specified as a string. See [Shell Requirements][] and
     [Default Windows Shell][]. **Default:** `false` (no shell).
   * `windowsVerbatimArguments` {boolean} No quoting or escaping of arguments is
@@ -666,7 +666,7 @@ child registers an event handler for the [`'disconnect'`][] event
 or the [`'message'`][] event. This allows the child to exit
 normally without the process being held open by the open IPC channel.*
 
-On UNIX-like operating systems, the [`child_process.spawn()`][] method
+On Unix-like operating systems, the [`child_process.spawn()`][] method
 performs memory operations synchronously before decoupling the event loop
 from the child. Applications with a large memory footprint may find frequent
 [`child_process.spawn()`][] calls to be a bottleneck. For more information,
@@ -729,7 +729,7 @@ changes:
   * `windowsHide` {boolean} Hide the subprocess console window that would
     normally be created on Windows systems. **Default:** `false`.
   * `shell` {boolean|string} If `true`, runs `command` inside of a shell. Uses
-    `'/bin/sh'` on UNIX, and `process.env.ComSpec` on Windows. A different
+    `'/bin/sh'` on Unix, and `process.env.ComSpec` on Windows. A different
     shell can be specified as a string. See [Shell Requirements][] and
     [Default Windows Shell][]. **Default:** `false` (no shell).
 * Returns: {Buffer|string} The stdout from the command.
@@ -780,7 +780,7 @@ changes:
   * `env` {Object} Environment key-value pairs.
   * `shell` {string} Shell to execute the command with. See
     [Shell Requirements][] and [Default Windows Shell][]. **Default:**
-    `'/bin/sh'` on UNIX, `process.env.ComSpec` on Windows.
+    `'/bin/sh'` on Unix, `process.env.ComSpec` on Windows.
   * `uid` {number} Sets the user identity of the process. (See setuid(2)).
   * `gid` {number} Sets the group identity of the process. (See setgid(2)).
   * `timeout` {number} In milliseconds the maximum amount of time the process
@@ -858,7 +858,7 @@ changes:
   * `encoding` {string} The encoding used for all stdio inputs and outputs.
     **Default:** `'buffer'`.
   * `shell` {boolean|string} If `true`, runs `command` inside of a shell. Uses
-    `'/bin/sh'` on UNIX, and `process.env.ComSpec` on Windows. A different
+    `'/bin/sh'` on Unix, and `process.env.ComSpec` on Windows. A different
     shell can be specified as a string. See [Shell Requirements][] and
     [Default Windows Shell][]. **Default:** `false` (no shell).
   * `windowsVerbatimArguments` {boolean} No quoting or escaping of arguments is
@@ -1255,7 +1255,7 @@ can be handled by the parent and some by the child.
 While the example above uses a server created using the `net` module, `dgram`
 module servers use exactly the same workflow with the exceptions of listening on
 a `'message'` event instead of `'connection'` and using `server.bind()` instead
-of `server.listen()`. This is, however, currently only supported on UNIX
+of `server.listen()`. This is, however, currently only supported on Unix
 platforms.
 
 #### Example: sending a socket object

doc/api/cluster.md

@@ -589,7 +589,7 @@ The `addressType` is one of:
 
 * `4` (TCPv4)
 * `6` (TCPv6)
-* `-1` (unix domain socket)
+* `-1` (Unix domain socket)
 * `'udp4'` or `'udp6'` (UDP v4 or v6)
 
 ## Event: 'message'

doc/api/fs.md

@@ -847,7 +847,7 @@ The times in the stat object have the following semantics:
 * `birthtime` "Birth Time" - Time of file creation. Set once when the
   file is created. On filesystems where birthtime is not available,
   this field may instead hold either the `ctime` or
-  `1970-01-01T00:00Z` (ie, unix epoch timestamp `0`). This value may be greater
+  `1970-01-01T00:00Z` (ie, Unix epoch timestamp `0`). This value may be greater
   than `atime` or `mtime` in this case. On Darwin and other FreeBSD variants,
   also set if the `atime` is explicitly set to an earlier value than the current
   `birthtime` using the utimes(2) system call.

doc/api/net.md

@@ -17,7 +17,7 @@ const net = require('net');
 
 ## IPC Support
 
-The `net` module supports IPC with named pipes on Windows, and UNIX domain
+The `net` module supports IPC with named pipes on Windows, and Unix domain
 sockets on other operating systems.
 
 ### Identifying paths for IPC connections
@@ -25,18 +25,18 @@ sockets on other operating systems.
 [`net.connect()`][], [`net.createConnection()`][], [`server.listen()`][] and
 [`socket.connect()`][] take a `path` parameter to identify IPC endpoints.
 
-On UNIX, the local domain is also known as the UNIX domain. The path is a
+On Unix, the local domain is also known as the Unix domain. The path is a
 filesystem pathname. It gets truncated to `sizeof(sockaddr_un.sun_path) - 1`,
 which varies on different operating system between 91 and 107 bytes.
 The typical values are 107 on Linux and 103 on macOS. The path is
 subject to the same naming conventions and permissions checks as would be done
-on file creation. If the UNIX domain socket (that is visible as a file system
+on file creation. If the Unix domain socket (that is visible as a file system
 path) is created and used in conjunction with one of Node.js' API abstractions
 such as [`net.createServer()`][], it will be unlinked as part of
 [`server.close()`][]. On the other hand, if it is created and used outside of
 these abstractions, the user will need to manually remove it. The same applies
 when the path was created by a Node.js API but the program crashes abruptly.
-In short, a UNIX domain socket once successfully created will be visible in the
+In short, a Unix domain socket once successfully created will be visible in the
 filesystem, and will persist until unlinked.
 
 On Windows, the local domain is implemented using a named pipe. The path *must*
@@ -44,7 +44,7 @@ refer to an entry in `\\?\pipe\` or `\\.\pipe\`. Any characters are permitted,
 but the latter may do some processing of pipe names, such as resolving `..`
 sequences. Despite how it might look, the pipe namespace is flat. Pipes will
 *not persist*. They are removed when the last reference to them is closed.
-Unlike UNIX domain sockets, Windows will close and remove the pipe when the
+Unlike Unix domain sockets, Windows will close and remove the pipe when the
 owning process exits.
 
 JavaScript string escaping requires paths to be specified with extra backslash
@@ -121,7 +121,7 @@ as reported by the operating system if listening on an IP socket
 (useful to find which port was assigned when getting an OS-assigned address):
 `{ port: 12346, family: 'IPv4', address: '127.0.0.1' }`.
 
-For a server listening on a pipe or UNIX domain socket, the name is returned
+For a server listening on a pipe or Unix domain socket, the name is returned
 as a string.
 
 ```js
@@ -241,7 +241,7 @@ added: v0.5.10
 * Returns: {net.Server}
 
 Start a server listening for connections on a given `handle` that has
-already been bound to a port, a UNIX domain socket, or a Windows named pipe.
+already been bound to a port, a Unix domain socket, or a Windows named pipe.
 
 The `handle` object can be either a server, a socket (anything with an
 underlying `_handle` member), or an object with an `fd` member that is a
@@ -385,7 +385,7 @@ added: v0.3.4
 -->
 
 This class is an abstraction of a TCP socket or a streaming [IPC][] endpoint
-(uses named pipes on Windows, and UNIX domain sockets otherwise). A
+(uses named pipes on Windows, and Unix domain sockets otherwise). A
 `net.Socket` is also a [duplex stream][], so it can be both readable and
 writable, and it is also an [`EventEmitter`][].
 
@@ -496,7 +496,7 @@ changes:
 -->
 
 Emitted after resolving the hostname but before connecting.
-Not applicable to UNIX sockets.
+Not applicable to Unix sockets.
 
 * `err` {Error|null} The error object. See [`dns.lookup()`][].
 * `address` {string} The IP address.
@@ -1112,7 +1112,7 @@ server.listen('/tmp/echo.sock', () => {
 });
 ```
 
-Use `nc` to connect to a UNIX domain socket server:
+Use `nc` to connect to a Unix domain socket server:
 
 ```console
 $ nc -U /tmp/echo.sock

doc/api/os.md

@@ -164,7 +164,7 @@ The properties included on each object include:
 ]
 ```
 
-Because `nice` values are UNIX-specific, on Windows the `nice` values of all
+Because `nice` values are Unix-specific, on Windows the `nice` values of all
 processors are always 0.
 
 ## os.endianness()
@@ -239,7 +239,7 @@ 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 UNIX-specific concept with no real equivalent on
+The load average is a Unix-specific concept with no real equivalent on
 Windows platforms. On Windows, the return value is always `[0, 0, 0]`.
 
 ## os.networkInterfaces()

doc/api/tls.md

@@ -1207,7 +1207,7 @@ changes:
   * `host` {string} Host the client should connect to. **Default:**
     `'localhost'`.
   * `port` {number} Port the client should connect to.
-  * `path` {string} Creates unix socket connection to path. If this option is
+  * `path` {string} Creates Unix socket connection to path. If this option is
     specified, `host` and `port` are ignored.
   * `socket` {stream.Duplex} Establish secure connection on a given socket
     rather than creating a new socket. Typically, this is an instance of