do_square

UNIX[1].shell范例精解(第4版)_code

#!/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