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

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

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NAME
       tell - Return current access position for an open channel

SYNOPSIS
       tell channelId
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DESCRIPTION
       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.

SEE ALSO
       file(n), open(n), close(n), gets(n), seek(n)

KEYWORDS
       access position, channel, seeking

Tcl					       8.1					  tell(n)