# fixes for bugs in bash-4.2 regarding empty strings in expand_string_for_rhs

f=abc
recho ${f##""a}
recho ${f##"$v"a}

recho ${f%%""c}
recho ${f%%"$v"c}

recho ${f//""a}
recho ${f//"$v"a}

recho ${f/""a""b/}
recho ${f/""c/}
recho ${f/"$v"c/}

unset foo empty
foo=aabbcc

recho ${foo/bb/}
recho ${foo/bb/$empty}

recho ${foo/}
recho ${empty/}

recho ${foo/ }
recho ${empty/ }
unset foo empty

S2=oenophile

recho ${S2^"$v"[aeiou]}
recho ${S2^^"$v"[aeiou]}

recho ${foo:-""}
recho ${foo:-""abc}

recho "${foo:-''}"
recho "${foo:-}"

if [[ $var == "" ]]; then
	echo good 1
fi

if [[ "$var"X == ""X ]]; then
	echo good 2
fi

if [ "$var"X == ""X"" ]; then
	echo good 3
fi

if [ X"" == X ]; then
	echo good 4
fi

if [[ X"" == X ]]; then
	echo good 5
fi

case x"" in
  x) echo 'ok 1'
     ;;
  x??) echo 'this would be really odd'
     ;;
  x?) echo 'does this prove anything?'
      echo x""x
     ;;
  *) echo 'no match'
     ;;
esac

if [[ x"" == x ]]; then
	echo ok 2
fi

if [[ x"" == x"" ]]; then
	echo ok 3
else
	echo bad 3
fi

case x"" in
x"")	echo ok 4 ;;
*)	echo bad 4;;
esac

if [[ x"" == x"" ]]; then
	echo ok 5
else
	echo bad 5
fi

case x"" in
"x")	echo ok 6 ;;
*)	echo bad 6;;
esac

case x"" in
"x")	echo CTLNUL 7 ;;
x)	echo ok 7 ;;
*)	echo bad 7 ;;
esac
