# examples from page 144 print -r "$(print -r \$PWD "\$PWD" ')a\`\$\\')" foo=${foo:-} X=1 while (( (X*=2) < 100 )); do print $X; done print -- $((celsius * 9./5 + 32)) # use -- in case result is negative X[2*(i+1)]=6 x[hello world]=hi