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    Command:

    seek

    
           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 stan-
           dard channel (stdin, stdout, or stderr), the return value from an invo-
           cation  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 positive 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 com-
           mand returns, even if the channel is in nonblocking mode.  It also dis-
           cards any buffered and unread input.  This  command  returns  an  empty
           string.   An  error occurs if this command is applied to channels whose
           underlying file or device does not support seeking.
    
           Note that offset values are byte offsets, not character offsets.   Both
           seek and tell operate in terms of bytes, not characters, unlike read.
    
    
    

    EXAMPLES

           Read a file twice:
                  set f [open file.txt]
                  set data1 [read $f]
                  seek $f 0
                  set data2 [read $f]
                  close $f
                  # $data1 == $data2 if the file wasn't updated
    
           Read the last 10 bytes from a file:
    
    
    

    KEYWORDS

           access position, file, seek
    
    
    

    Tcl 8.1 seek(3tcl)

    
    
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