wholenum

来自「UNIX[1].shell范例精解(第4版)_code」· 代码 · 共 15 行

#!/bin/bash
# Scriptname: wholenum
# Purpose:The expr command tests that the user enters an 
# integer -- bash shell
	
echo "Enter an integer."
read number
if expr "$number" + 0 >& /dev/null 
then
	:
else
	echo "You did not enter an integer value."
	exit 1
fi