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doc: stdout, stderr and stdin are all Duplex streams #11194

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doc: stdout, stderr and stdin are all Duplex streams #11194

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21 changes: 14 additions & 7 deletions doc/api/process.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1509,8 +1509,10 @@ Android)

* {Stream}

The `process.stderr` property returns a [Writable][] stream connected to
`stderr` (fd `2`).
The `process.stderr` property returns a stream connected to
`stderr` (fd `2`). It is a [`net.Socket`][] (which is a [Duplex][]
stream) unless fd `2` refers to a file, in which case it is
a [Writable][] stream.

Note: `process.stderr` differs from other Node.js streams in important ways,
see [note on process I/O][] for more information.
Expand All @@ -1519,8 +1521,10 @@ see [note on process I/O][] for more information.

* {Stream}

The `process.stdin` property returns a [Readable][] stream equivalent to or
associated with `stdin` (fd `0`).
The `process.stdin` property returns a stream connected to
`stdin` (fd `0`). It is a [`net.Socket`][] (which is a [Duplex][]
stream) unless fd `0` refers to a file, in which case it is
a [Readable][] stream.

For example:

Expand All @@ -1539,7 +1543,7 @@ process.stdin.on('end', () => {
});
```

As a [Readable][] stream, `process.stdin` can also be used in "old" mode that
As a [Duplex][] stream, `process.stdin` can also be used in "old" mode that
is compatible with scripts written for Node.js prior to v0.10.
For more information see [Stream compatibility][].

Expand All @@ -1551,8 +1555,10 @@ must call `process.stdin.resume()` to read from it. Note also that calling

* {Stream}

The `process.stdout` property returns a [Writable][] stream connected to
`stdout` (fd `1`).
The `process.stdout` property returns a stream connected to
`stdout` (fd `1`). It is a [`net.Socket`][] (which is a [Duplex][]
stream) unless fd `1` refers to a file, in which case it is
a [Writable][] stream.

For example, to copy process.stdin to process.stdout:

Expand Down Expand Up @@ -1793,6 +1799,7 @@ cases:
[TTY]: tty.html#tty_tty
[Writable]: stream.html#stream_writable_streams
[Readable]: stream.html#stream_readable_streams
[Duplex]: stream.html#stream_duplex_and_transform_streams
[Child Process]: child_process.html
[Cluster]: cluster.html
[`process.exitCode`]: #process_process_exitcode
Expand Down