'''[http://www.tcl.tk/man/tcl/TclCmd/tclvars.htm%|%tclvars]''', a page in the
[manpages%|%official documentation], describes the built-in Tcl variables 



** See Also **

   [Magic names]:   

   [Tcl syntax]:   
   


** Documentation **

   [http://www.tcl.tk/man/tcl/TclCmd/tclvars.htm%|%official reference]:   



** Description **

   `$[argc]`:   the number of arguments the script was called with.

   `$[argv]`:   a list of arguments passed to the script.  Unlike [C], `$[argv]` does not include the name of the application itself among the argument list. For that, there is `$[argv0]`.

   `$[argv0]`:   the name of the interpreter itself

   `$auto_execs`:   Used by `$auto_execok` to record information about whether particular commands exist as executable files. 

   `$[auto_index]`:   Used by `$auto_load` to save the index information read from disk.


   `$auto_noexec`:   

   `$auto_noload`:   

   `$[auto_oldpath]`:   

   `$[auto_path]`:   

   `$[dir]`:   

   `$[env]`:   

   `$env([TCL_LIBRARY]`):   

   `$env([TCLLIBPATH]`):   

   `$[errorCode]`:   

   `$[errorInfo]`:   

   `$[tclDefaultLibrary]` on unix:   

   `$[tcl_interactive]`:   

   `$[tcl_libpath]`:   

   `$[tcl_library]`:   

   `$[tcl_patchLevel]`:   

   `$[tcl_pkgPath]`:   

   `$[tcl_platform]`:   

   `$[tcl_precision]`:   

   `$[tcl_rcFileName]`:   

   `$[tcl_rcRsrcName]`:   

   `$[tcl_traceCompile]`:   

   `$[tcl_traceExec]`:   

   `$[tcl_version]`:   

   `$unknown_pending`:   

   `$[tcl_wordchars]` and `$[tcl_nonwordchars]`:   


There are also a number of special shell environment variables which can
influence Tcl behavior.  These include:

   [CC]:   

   [COMSPEC]:   on Windows

   [HOME]:   

   [HOMEPATh%|%HOMEDRIVE]:   on Windows

   [HOMEPATH]:   on Windows

   [LANG]:   

   [LC_ALL]:   

   [LC_CTYPE]:   

   [PATH]:   

   [PATHEXT]:   on Windows

   [SHLIB_CFLAGS]:   

   [TCL_LIBRARY]:   

   [TCLLIBPATH]:   

   [TCLTEST_OPTIONS]:   

   [TZ]:   on Windows

   [windir]:   on Windows



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