rbash --version (return code: 0)
GNU bash, version 4.3.46(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
rbash --help (return code: 0)
GNU bash, version 4.3.46(1)-release-(x86_64-pc-linux-gnu)
Usage: rbash [GNU long option] [option] ...
rbash [GNU long option] [option] script-file ...
GNU long options:
--debug
--debugger
--dump-po-strings
--dump-strings
--help
--init-file
--login
--noediting
--noprofile
--norc
--posix
--rcfile
--restricted
--verbose
--version
Shell options:
-ilrsD or -c command or -O shopt_option (invocation only)
-abefhkmnptuvxBCHP or -o option
Type `rbash -c "help set"' for more information about shell options.
Type `rbash -c help' for more information about shell builtin commands.
Use the `bashbug' command to report bugs.