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RedHat 9 (Linux i386) - man page for puts (redhat section n)

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


       puts - Write to a channel

       puts ?-nonewline? ?channelId? string

       Writes  the  characters given by string to the channel given by channelId.  ChannelId must
       be a channel identifier such as returned from a previous invocation of open or socket.  It
       must have been opened for output. If no channelId is specified then it defaults to stdout.
       Puts normally outputs a newline character after string, but this feature may be suppressed
       by specifying the -nonewline switch.

       Newline	characters  in the output are translated by puts to platform-specific end-of-line
       sequences according to the current value of the -translation option for the  channel  (for
       example,  on  PCs  newlines are normally replaced with carriage-return-linefeed sequences;
       on Macintoshes newlines are normally replaced with carriage-returns).  See the  fconfigure
       manual entry for a discussion on ways in which fconfigure will alter output.

       Tcl  buffers output internally, so characters written with puts may not appear immediately
       on the output file or device;  Tcl will normally delay output until the buffer is full  or
       the channel is closed.  You can force output to appear immediately with the flush command.

       When  the  output  buffer  fills  up,  the  puts command will normally block until all the
       buffered data has been accepted for output by the operating system.  If	channelId  is  in
       nonblocking  mode then the puts command will not block even if the operating system cannot
       accept the data.  Instead, Tcl continues to buffer the data and writes  it  in  the  back-
       ground  as  fast as the underlying file or device can accept it.  The application must use
       the Tcl event loop for nonblocking output to work;  otherwise Tcl never finds out that the
       file  or  device  is  ready for more output data.  It is possible for an arbitrarily large
       amount of data to be buffered for a channel in nonblocking mode,  which	could  consume	a
       large  amount of memory.  To avoid wasting memory, nonblocking I/O should normally be used
       in an event-driven fashion with the fileevent command (don't invoke puts unless	you  have
       recently been notified via a file event that the channel is ready for more output data).

       file(n), fileevent(n)

       channel, newline, output, write

Tcl					       7.5					  puts(n)

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