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

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


       tell - Return current access position for an open channel

       tell channelId

       Returns	an  integer  string  giving the current access position in channelId.  This value |
       returned is a byte offset that can be passed to seek in order to set the channel to a par- |
       ticular	position.   Note  that this value is in terms of bytes, not characters like read.
       The value returned is -1 for channels that do not support seeking.

       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.

       file(n), open(n), close(n), gets(n), seek(n), Tcl_StandardChannels(3)

       access position, channel, seeking

Tcl					       8.1					  tell(n)
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