linux 使用if 让两个百分数比大小

去掉百分号，比较数值：num1=20.1%num2=22.3%diffnum=$(echo "${num1%%%}-${num2%%%}"|bc)echo $diffnumif ...

我分享一个2个数字的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

fi

Shell代码 #!/bin/bash PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin ram_max=9 ram=10.2 #ram大于ram_max打印出1赋值给变量check check=`echo $ram >$ram_max bc` #判断如果check匹配1打印1，注意空格(shell格式不正确会导致运行错误) if [ $check = 1 ] then echo 1 fi

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