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OpenDarwin 7.2.1 - man page for seek (opendarwin section n)

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

_________________________________________________________________________________________________

NAME
       seek - Change the access position for an open channel

SYNOPSIS
       seek channelId offset ?origin?
_________________________________________________________________

DESCRIPTION
       Changes the current access position for channelId.

       ChannelId must be an identifier for an open channel such as a Tcl standard channel (stdin, |
       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  offset and origin arguments specify the position at which the next read or write will
       occur for channelId. Offset must be an integer (which may be negative) and origin must  be
       one of the following:

       start	 The  new  access  position will be offset bytes from the start of the underlying
		 file or device.

       current	 The new access position will be offset bytes from the current access position; a
		 negative  offset  moves  the access position backwards in the underlying file or
		 device.

       end	 The new access position will be offset bytes from the end of the file or device.
		 A negative offset places the access position before the end of file, and a posi-
		 tive offset places the access position after the end of file.

       The origin argument defaults to start.

       The command flushes all buffered output for the channel before the command  returns,  even
       if  the	channel  is in nonblocking mode.  It also discards any buffered and unread input.
       This command returns an empty string.  An error occurs if this command is applied to chan-
       nels whose underlying file or device does not support seeking.

       Note that offset values are byte offsets, not character offsets.  Both seek and tell oper- |
       ate in terms of bytes, not characters, unlike read.

SEE ALSO
       file(n), open(n), close(n), gets(n), tell(n), Tcl_StandardChannels(3)

KEYWORDS
       access position, file, seek

Tcl					       8.1					  seek(n)


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