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flush(n) Tcl Built-In Commands flush(n) 





NAME


flush - Flush buffered output for a channel






SYNOPSIS


flush channelId








DESCRIPTION


Flushes any output that has been buffered for
  channelId.


ChannelId must be an identifier for an open channel such as
    a Tcl standard channel (stdout or stderr), the return value
    from an invocation of open or socket, or the result of a
    channel creation command provided by a Tcl extension. The channel must have
    been opened for writing.


If the channel is in blocking mode the command does not return
    until all the buffered output has been flushed to the channel. If the
    channel is in nonblocking mode, the command may return before all buffered
    output has been flushed; the remainder will be flushed in the background as
    fast as the underlying file or device is able to absorb it.






EXAMPLE


Prompt for the user to type some information in on the
  console:






puts -nonewline "Please type your name: "
flush stdout
gets stdin name
puts "Hello there, $name!"








SEE ALSO


file(n), open(n), socket(n), Tcl_StandardChannels(3)






KEYWORDS


blocking, buffer, channel, flush, nonblocking, output







  

    7.5
    Tcl