CAS - Character And String utility procedures

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 NAME
       cas - Character And String utility procedures

 SYNOPSIS
       package require Tcl

       package require cas 0.1
       namespace import ::cas::*

       randAZChar

       randAZazChar

       randAZazString  length

       strUnique str   ?length? ?uStr?

 DESCRIPTION
       A  Tcl  extension  that  provides  a  set of character and
       string utility procedures.

 COMMANDS
       randAZChar
              Returns one random character in the range A-Z.

       randAZazChar
              Returns one random character in the range A-Za-z.

       randAZazString
              Generates a string  of  random  characters  in  the
              range A-Za-z, of length length.

       strUnique str ?length? ?uStr?
              Returns an uppercase string not in str.
              str: String to check.
              length:  Length  of string to generate, defaults to 8.
              uStr: A potential unique string - if supplied,  use
              it  and  its  length at start of search, and ignore length.
              Throws an error if  unable  to  generate  a  unique
              string after 100 attempts.