Source code in the unix programming language

x=2
while test $x -le 8; do
        echo $x
        x=`expr $x + 2` || exit $?
done

for x in `jot - 2 8 2`; do echo $x; done

x=0
while (((x += 2) <= 8))
do
	print -r "$x"
done

for x in {2..8..2}
do
	print -r "$x"
done

for (( x=2; $x<=8; x=$x+2 )); do
  printf "%d, " $x
done

for x in {2..8..2} 
do
  echo $x
done

foreach x (`jot - 2 8 2`)
	echo $x
end