puts ?-nonewline? ?channelId?string
Writes the characters given by string to the channel given
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
string, but this feature may be suppressed by specifying the
Newline characters in the output are translated by puts to
platform-specific end-of-line sequences according to the current
value of the
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 background 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).
Windows 8.1. Windows Server 2012 R2. Windows 10. Windows Server 2016. Windows Server 2019. Windows 11. Windows Server 2022.
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