Option Aliases
==============
Some options have alternative names. These aliases are never used for
output, but can be used just like normal option names when specifying
options to the shell.
BRACE_EXPAND
_NO__IGNORE_BRACES (ksh and bash compatibility)
DOT_GLOB
GLOB_DOTS (bash compatibility)
HASH_ALL
HASH_CMDS (bash compatibility)
HIST_APPEND
APPEND_HISTORY (bash compatibility)
HIST_EXPAND
BANG_HIST (bash compatibility)
LOG
_NO__HIST_NO_FUNCTIONS (ksh compatibility)
MAIL_WARN
MAIL_WARNING (bash compatibility)
ONE_CMD
SINGLE_COMMAND (bash compatibility)
PHYSICAL
CHASE_LINKS (ksh and bash compatibility)
PROMPT_VARS
PROMPT_SUBST (bash compatibility)
STDIN
SHIN_STDIN (ksh compatibility)
TRACK_ALL
HASH_CMDS (ksh compatibility)