fx()
{
i=0
for (( ; i < 3; i++ ))
do
	echo $i
done

for (( i=0; ; i++ ))
do
	if (( i >= 3 )); then
		break;
	fi
	echo $i
done

for (( i=0; i<3; ))
do
	echo $i
	(( i++ ))
done

i=0
for (( ; ; ))
do
	if (( i > 2 )); then
		break;
	fi
	echo $i;
	(( i++ ))
done

i=0
for ((;;))
do
	if (( i > 2 )); then
		break;
	fi
	echo $i;
	(( i++ ))
done
}

for (( i=0; "i < 3" ; i++ ))
do
	echo $i
done

i=0
for (( ; "i < 3"; i++ ))
do
	echo $i
done

for (( i=0; ; i++ ))
do
	if (( i >= 3 )); then
		break;
	fi
	echo $i
done

for ((i = 0; ;i++ ))
do
	echo $i
	if (( i < 3 )); then
		(( i++ ))
		continue;
	fi
	break
done

type fx
fx

# errors 
for (( i=0; "i < 3" ))
do
	echo $i
done
echo $?

for (( i=0; i < 3; i++; 7 ))
do
	echo $i
done
echo $?

# one-liners added in post-bash-2.04
for     ((i=0; i < 20; i++)) do : ; done
echo $i

for     ((i=0; i < 20; i++)) { : ; }
echo $i

# added post-bash-4.2
for (( i = j = k = 1; i % 9 || (j *= -1, $( ((i%9)) || printf " " >&2; echo 0), k++ <= 10); i += j ))
do
printf "$i"
done

echo

( for (( i = j = k = 1; i % 9 || (j *= -1, $( ((i%9)) || printf " " >&2; echo 0), k++ <= 10); i += j ))
do
printf "$i"
done )

echo

for (( i = 4; ;i--)) ; do echo $i; if (( $i == 0 )); then break; fi; done

for (( i = 4;;i--)) ; do echo $i; if (( $i == 0 )); then break; fi; done