'''chan pending''' ''mode channelId''

Returns the number of ''bytes'' in Tcl's buffers for the channel ''channelId'' in the direction specified by ''mode'' (which must be '''input''' or '''output''').

This subcommand was introduced by [TIP]#287[http://tip.tcl.tk/287.html].
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[[
[Category Command] of [Tcl] 8.5 |
[Category Channel]
]]