How does one start and interact with OraTCL?

One can start OraTCL in interactive or batch mode by running the
"oratclsh" command (Unix and Windows) located in your ORACLE_HOME/bin
directory.

Interactive Mode:

$ oratclsh
ORATCLSH for Solaris: Version 9.2.9.4.0 - Production on 08-OCT-2003 21:14:33
(c) Copyright 2003 Oracle Corporation.  All rights reserved.

oratclsh[1]- set x "Look Ma, "
oratclsh[2]- set y "I can write TCL scripts."
oratclsh[3]- puts "$x $y"
Look Ma, I can write TCL script.
oratclsh[4]- exit

Batch Mode:
Write a TCL script, say, hello.tcl and execute with command
"oratclsh hello.tcl":

puts "Hello World...n"
puts "TCL version = [info tclversion]"
puts "Script Name = [info script]"
exit 0