---
name: "std"
section: "3tcl"
platform: "linux"
package: "tcllib"
version: "2.0+dfsg-4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/std"
---

# std(3tcl)

Standard I/O, unification of stdin and stdout

```

```

## NAME

tcl::chan::std - Standard I/O, unification of stdin and stdout

## SYNOPSIS

package require **Tcl 8.5 9**

package require **TclOO**

package require **tcl::chan::core ?1.1?**

package require **tcl::chan::std ?1.1?**

**::tcl::chan::std**

```

```

## DESCRIPTION

The **tcl::chan::std** package provides a command creating a standard channel which unifies stdin and stdout into a single read- and writable channel. The result is not seek-able, like the original standard channels.

The internal **TclOO** class implementing the channel handler is a sub-class of the **tcl::chan::core** framework.

## API

- **::tcl::chan::std**

  This command creates the std channel and returns its handle.

  The channel is created only once, on the first call, and all future calls simply return this handle.

## BUGS, IDEAS, FEEDBACK

This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category *virtchannel* of the *Tcllib Trackers* \[http://core.tcl.tk/tcllib/reportlist\]. Please also report any ideas for enhancements you may have for either package and/or documentation.

When proposing code changes, please provide *unified diffs*, i.e the output of **diff -u**.

Note further that *attachments* are strongly preferred over inlined patches. Attachments can be made by going to the **Edit** form of the ticket immediately after its creation, and then using the left-most button in the secondary navigation bar.

## KEYWORDS

reflected channel, standard io, stdin, stdout, tip 219, virtual channel

## CATEGORY

Channels

## COPYRIGHT

```
Copyright (c) 2011 Andreas Kupries <andreas_kupries@users.sourceforge.net>
```