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changing col(1) command stdout as fully buffered?

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Top Forums UNIX for Advanced & Expert Users changing col(1) command stdout as fully buffered?
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Old 06-09-2006
MySQL changing col(1) command stdout as fully buffered?
Hi All,

I am talking about unix col(1) command used for some reverse line filtering etc.
And I notice that the stdout of this command is line buffered i.e. the stdout will flush the data in its buffer line by line. So the number of writes performed by stdout are more.

So now if I make stdout as fully buffered it will reduce the write hits. Smilie

But if I do these changes I think there will some problems
-> when slow terminals use col(1) as command , then the turn around time will get reduce for it self.
eg: cat file | col -b | lp
Here lp will receive data in terms of buffer size but before it was receving in terms of each lines.

So can I change change col(1) command's stdout to fully buffered?

So do any of you know some more problems related with this change , and can I see some link about col(1) command design stating that it should be either line buffered or fully buffered etc.


Waiting for positive replay,
Sunil kumar.
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LEARN ABOUT OPENSOLARIS

flush

flush(1T)						       Tcl Built-In Commands							 flush(1T)

__________________________________________________________________________________________________________________________________________________

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  chan-
       nel  is in nonblocking mode, the command may return before all buffered output has been flushed; the remainder will be flushed in the back-
       ground 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(1T), open(1T), socket(1T), Tcl_StandardChannels(3TCL)

KEYWORDS

       blocking, buffer, channel, flush, nonblocking, output

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWTcl	      |
       +--------------------+-----------------+
       |Interface Stability | Uncommitted     |
       +--------------------+-----------------+
NOTES

       Source for Tcl is available on http://opensolaris.org.

Tcl									7.5								 flush(1T)