do_square

来自「Advanced Bash&#8722 Scripting Guide An 」· 代码 · 共 13 行

#!/bin/sh
# Script name: do_square
function square {
    sq=`expr $1 \* $1`
    echo  "Number to be squared is $1."
    echo  "The result is $sq "
}

echo "Give me a number to square. "
read number
value_returned=`square $number` 	# Command substitution
echo   $value_returned