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

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

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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 a channel identifier
       such as returned from a previous invocation of open or  socket.	 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)

KEYWORDS
       access position, file, seek

Tcl					       8.1					  seek(n)
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