Purpose: to document the various Tcl commands available to perform functions for which programmers commonly think they need external commands.

   * [clock] instead of external commands for date or time
   * [glob] instead of external commands for file listing commands like dir or ls
   * [open]/[read]/[close] instead of external commands for reading files
   * while it isn't built in, see [tail] for info on doing basic 'read me the end of a file' type processing.

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[Arts and crafts of Tcl-tk programming]