seek(3Tcl)

NAME
     seek - Change the access position for an open file

SYNOPSIS
     seek fileId offset ?origin?


DESCRIPTION
     Change the current access position for fileId.  FileId must have been the
     return value from a previous call to open, or it may be stdin, stdout, or
     stderr to refer to one of the standard I/O channels.  The offset and
     origin arguments specify the position at which the next read or write
     will occur for fileId.  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
          file.

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

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

     The origin argument defaults to start.  This command returns an empty
     string.


KEYWORDS
     access position, file, seek