do_square

来自「UNIX+shell范例精解（第4版）代码」· 代码 · 共 12 行

#!/bin/sh
# Scriptname: 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