合格linux运维人员必会的30道shell编程实践题及讲解-11

hyytaojunming

　　企业实践题11：
　　开发shell脚本分别实现以脚本传参以及read读入的方式比较2个整数大小。以屏幕输出的方式提醒用户比较结果。
　　注意：一共是开发2个脚本。当用脚本传参以及read读入的方式需要对变量是否为数字、并且传参个数做判断。
　　我的脚本=========================



#read读入方式
#!/bin/bash
read -p "pls input num1: " num1
read -p "pls input num2: " num2
[ -z $num1 -a -z $num2 ] && {
echo "USAGE: pls input two num {num1 num2}"
exit 1
}
[ "`echo "$num1"|sed -r ' s#[^0-9]##g'`" = "$num1" ] || {
echo "first arg must be int."
exit 2
}
[ "`echo "$num2"|sed -r ' s#[^0-9]##g'`" = "$num2" ] || {
echo "second arg must be int."
exit 3
}
[ $num1 -lt $num2 ] && {
echo "$num1 < $num2"
}
[ $num1 -gt $num2 ] && {
echo "$num1 > $num2"
}
[ $num1 -eq $num2 ] && {
echo "$num1 = $num2"
}


#脚本传参方式
#!/bin/bash
[ $# -ne 2 ]&&{
echo "USAGE: num1 num2"
exit 1
}
[ "`echo "$1"|sed -r ' s#[^0-9]##g'`" = "$1" ]||{
echo "first arg must be int."
exit 2
}
[ "`echo "$2"|sed -r ' s#[^0-9]##g'`" = "$2" ]||{
echo "second arg must be int."
exit 2
}
[ $1 -lt $2 ]&&{
echo "$1<$2"
exit 0
}
[ $1 -eq $2 ]&&{
echo "$1=$2"
exit 0
}
[ $1 -gt $2 ]&&{
echo "$1>$2"
exit 0
}