的SHELL 你可以举一反三《Linux就该这么学》中有个Linux命令大全#1.判断是不是两个

数

[ $# -ne 2 ] &&{

echo "Usage:$0 num1 num2"

exit 1

}

#2.判断是否为数字

expr $1 + $2 + 999 &>/dev/null

[ $? -ne 0 ] &&{ echo "请输入两个整数

"

exit 2

}

if [ $1 -gt $2 ]

then

echo "$1>$2"

elif [ $1 -lt $2 ]

then

echo "$1<$2"

else

echo "$1=$2"

fi

========================

read -p "please two number: " a b

expr $a + $b + 999 &>/dev/null

if [ $? -ne 0 ]

then

echo "请输入两个整数"

exit 1

else

if [ $a -gt $b ]

then

echo "$a>$b"

elif [ $a -lt $b ]

then

echo "$a<$b"

else

echo "$a=$b"

fi

A=30B=10if [ "$A" -gt "$B" ]then echo "first"else echo "second"fi