tell(n) Tcl Built-In Commands tell(n) NAME tell - Return current access(2,5) position for an open(2,3,n) channel SYNOPSIS tell channelId DESCRIPTION Returns an integer string(3,n) giving the current access(2,5) position in(1,8) chan- nelId. This value returned is a byte offset that can be passed to seek in(1,8) order to set(7,n,1 builtins) the channel to a particular position. Note that this value is in(1,8) terms of bytes, not characters like read(2,n,1 builtins). The value returned is -1 for channels that do not support seeking. ChannelId must be an identifier for an open(2,3,n) channel such as a Tcl stan- dard channel (stdin, stdout, or stderr), the return value from an invo- cation of open(2,3,n) or socket(2,7,n), or the result of a channel creation command provided by a Tcl extension. SEE ALSO file(1,n)(n), open(2,3,n)(n), close(2,7,n)(n), gets(3,n)(n), seek(n), Tcl_StandardChannels(3) KEYWORDS access(2,5) position, channel, seeking Tcl 8.1 tell(n)