flush

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



Tcl                                   7.5                             flush(n)