Extended Tcl has:

   * [abs]
   * [acos]
   * [alarm]
   * [asin]
   * [atan2]
   * [atan]
   * [bsearch]
   * [catclose]
   * [catgets]
   * [catopen]
   * [ccollate]
   * [cconcat]
   * [ceil]
   * [cequal]
   * [chgrp]
   * [chmod]
   * [chown]
   * [chroot]
   * [cindex]
   * [clength]
   * [cmdtrace]
   * [commandloop]
   * [cosh function%|%cosh]
   * [cos]
   * [crange]
   * [csubstr]
   * [ctoken]
   * [ctype]
   * [double]
   * [dup]
   * [echo]
   * [edprocs]
   * [execl]
   * [exp]
   * [fcntl]
   * [flock]
   * [floor]
   * [fmod]
   * [fork]
   * [for_array_keys]
   * [for_recursive_glob]
   * [ftruncate]
   * [funlock]
   * [host_info]
   * [hypot]
   * [id]
   * [infox]
   * [intersect3]
   * [intersect]
   * [int]
   * [keyldel]
   * [keylget]
   * [keylkeys]
   * [keylset]
   * [kill]
   * [lassign]
   * [lcontain]
   * [lempty]
   * [lgets]
   * [link]
   * [lmatch]
   * [log10]
   * [log]
   * [loop]
   * [lrmdups]
   * [lvarcat]
   * [lvarpop]
   * [lvarpush]
   * [mainloop]
   * [max]
   * [min]
   * [nice]
   * [pipe]
   * [popd]
   * [pow]
   * [profile]
   * [profrep]
   * [pushd]
   * [random]
   * [readdir]
   * [read_file]
   * [recursive_glob]
   * [replicate]
   * [round]
   * [saveprocs]
   * [scancontext]
   * [scanfile]
   * [scanmatch]
   * [select]
   * [showproc]
   * [signal]
   * [sinh]
   * [sin]
   * [sleep]
   * [sqrt]
   * [sync]
   * [system]
   * [tanh]
   * [tan]
   * [times]
   * [translit]
   * [try_eval]
   * [umask]
   * [union]
   * [wait]
   * [write_file]
   * [help]
   * [helpcd]
   * [helppwd]
   * [apropos]
   * [auto_commands]
   * [buildpackageindex]
   * [convert_lib]
   * [loadlibindex]
   * [auto_packages]
   * [auto_load_file]
   * [searchpath]

The following global variables are set and/or used by the Tcl shell (not to be confused with [tclsh]).

    :   '''argv0'''
Contains the name of the Tcl program specified on the command line or the name that the Tcl shell was invoked under if no program was specified.  argc Contains a count of the number of argv arguments (0 if none).
    :   '''argv'''
A list containing the arguments passed in from the command line, excluding arguments used by the Tcl shell.  The first element is the first passed argument, not the program name.
    :   '''tcl_interactive'''
Set to 1 if Tcl shell is invoked interactively, or 0 if the Tcl shell is directly executing a script.  Normally checked by scripts so that they can function as a standalone application if specified on the command line, but merely load in and not execute if loaded during an interactive invocation of Tcl.
    :   '''auto_path'''
Path to search to locate Tcl autoload libraries.  Used by the both the Tcl and TclX library autoloading facility.
    :   '''tclx_library'''
Path to the TclX runtime library.  If your running the TclX shell or an application based on it (like wishx).  The TclX initialization file normally adds this to the auto_path.
    :   '''tkx_library'''
Path to the TkX runtime library.  This is set only if your application has called Tkx_Init.  The TkX initialization file normally adds this to the auto_path.
    :   '''tcl_prompt1'''
Contains code to run to output the prompt used when interactively prompting for commands.
    :   '''tcl_prompt2'''
Contains code to run to output the prompt used when interactively prompting for continuation of an incomplete command.
    :   '''TCLXENV'''
Array that contains information used internally by various Tcl procedures that are part of the TclX shell.

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