** Synopsis **

 package require Tcl 8.6
 lassign [chan pipe] readChanId writeChanId
 ...
 close $readChanId; close $writeChanId

** Description **

Creates a standalone anonymous pipe and returns a pair of channel handles for its read and write ends, in this order.

The most useful way to use such pipes is to redirect standard channel(s) of a process to be run using [[exec ... &]] in which case it becomes possible to close the stdin of the spawned process forcing it to detect EOF and exit while collecting what it writes on its stdout/stderr. For instance, the [tclgpg] extension makes heavy use of this technique to control the '''gpg''' binary being executed.

This subcommand was introduced by [TIP] #304 [http://tip.tcl.tk/304.html] and is mostly a rip of the [pipe] command implementation from [Tclx].

** Availability **

The implementation is available in Tcl >= 8.6.

[kostix] has created a TEA-based extension out of this implementation called [tclpipe]. It can be used with (supposedly) any version of Tcl (tested on 8.4 and 8.5).

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