.: .: Is a directory
bash: -c: option requires an argument
bash: --badopt: invalid option
bash [GNU long option] [option] ...
bash [GNU long option] [option] script-file ...
GNU long options:
	--debug
	--debugger
	--dump-po-strings
	--dump-strings
	--help
	--init-file
	--login
	--noediting
	--noprofile
	--norc
	--posix
	--pretty-print
	--rcfile
	--restricted
	--verbose
	--version
Shell options:
	-ilrsD or -c command or -O shopt_option		(invocation only)
	-abefhkmnptuvxBCEHPT or -o option
bash: --initfile: invalid option
bash [GNU long option] [option] ...
bash [GNU long option] [option] script-file ...
GNU long options:
	--debug
	--debugger
	--dump-po-strings
	--dump-strings
	--help
	--init-file
	--login
	--noediting
	--noprofile
	--norc
	--posix
	--pretty-print
	--rcfile
	--restricted
	--verbose
	--version
Shell options:
	-ilrsD or -c command or -O shopt_option		(invocation only)
	-abefhkmnptuvxBCEHPT or -o option
bash: -q: invalid option
bash [GNU long option] [option] ...
bash [GNU long option] [option] script-file ...
GNU long options:
	--debug
	--debugger
	--dump-po-strings
	--dump-strings
	--help
	--init-file
	--login
	--noediting
	--noprofile
	--norc
	--posix
	--pretty-print
	--rcfile
	--restricted
	--verbose
	--version
Shell options:
	-ilrsD or -c command or -O shopt_option		(invocation only)
	-abefhkmnptuvxBCEHPT or -o option
this-bash this-bash
$- for -c includes c
bash: line 0: badopt: invalid shell option name
checkwinsize:cmdhist:complete_fullquote:extquote:force_fignore:globasciiranges:globskipdots:hostcomplete:interactive_comments:patsub_replacement:progcomp:promptvars:sourcepath
checkhash:checkwinsize:cmdhist:complete_fullquote:extquote:force_fignore:globasciiranges:globskipdots:hostcomplete:interactive_comments:patsub_replacement:progcomp:promptvars:sourcepath
cmdhist:complete_fullquote:extquote:force_fignore:globasciiranges:globskipdots:hostcomplete:interactive_comments:patsub_replacement:progcomp:promptvars:sourcepath
./invocation1.sub: line 40: BASHOPTS: readonly variable
braceexpand:hashall:interactive-comments
braceexpand:hashall:interactive-comments
hashall:interactive-comments
hashall:interactive-comments
braceexpand:hashall:interactive-comments:noglob
braceexpand:hashall:interactive-comments:noglob
./invocation2.sub: line 50: SHELLOPTS: readonly variable
for i in 1 2 3;
do
    select var in a b c;
    do
        echo $REPLY;
    done <<< a; echo answer was $REPLY;
done

for ((i=1; i <= 3; i++ ))
do
    echo $(( 2**$i ));
done

this is bash_logout
a
a
bad-interp
./invocation.tests: ./x23: nosuchfile: bad interpreter: No such file or directory
cannot execute binary file