Linux please. bash shell.

$1.$Your script will then need to solve these brace expansion exercises:

a$.$Create the files ~$/$Documents$/$cis$190/$lab$11.$a and ~$/$Documents$/$cis$190/$lab$11.$b and ~$/$Documents$/$cis$190/$lab$11.$c in one command using brace expansion.

b$.$List the contents of ~$/$Documents ~$/$Downloads$,$ ~$/$Sites in one ls command using brace expansion