These global variables are defined or used by the
procedures in the Tcl library:
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
If set to any value, then unknown will not
attempt to auto-exec any commands.
auto_noload
If set to any value, then unknown will not
attempt to auto-load any commands.
auto_path
If set, then it must contain a valid Tcl list giving
directories to search during auto-load operations.
env(TCL_LIBRARY)
If set, then it specifies the location of the directory
containing library scripts (the value of this variable will
be returned by the command info library). If
this variable is not set then a default value is used.
env(TCLLIBPATH)
If set, then it must contain a valid Tcl list giving
directories to search during auto-load operations. This
variable is only used if auto_path is not
defined.
unknown_active
This variable is set by unknown to indicate that
it is active. It is used to detect errors where
unknown recurses on itself infinitely. The
variable is unset before unknown returns.