Tcl/Tk in a Nutshell

Name

seek

seek channelId offset [origin]

Set position for random access to I/O channel channelId. Specify starting byte position using integer value offset relative to origin, which must be one of the following:

start	Offset bytes from start of the file (default).
current	Offset bytes from the current position (positive or negative).
end	Offset bytes relative to the end of file (positive or negative).