In [1]:

%%bash
((ii=1))
(
    cat <<EOF
a
b
c
EOF
) | while read str ; do 
    echo "$ii : $str"
    ((ii+=1))
done

1 : a
2 : b
3 : c

In [2]:

%%script bc
7 + 11

In [3]:

%%sh
X=19
echo $X

In [4]:

X=17
%%sh
echo $X

executing special commands in cell: "%%sh" can only appear at the start of the cell