BASH_FUNC_which%%
DBUS_SESSION_BUS_ADDRESS
HISTCONTROL
HISTSIZE
HOME
HOSTNAME
LANG
LESSOPEN
LOGNAME
LS_COLORS
MAIL
PATH
PWD
SELINUX_LEVEL_REQUESTED
SELINUX_ROLE_REQUESTED
SELINUX_USE_CURRENT_RANGE
SHELL
SHLVL
SSH_CLIENT
SSH_CONNECTION
SSH_TTY
TERM
USER
XDG_RUNTIME_DIR
XDG_SESSION_ID
_
which_declare