脚本 calc.sh
echo "shell脚本:计算加减乘除。文件名称:$0"
echo "输入+,-,x,/"
echo "格式示例:sh calc.sh 10 2 +"
a=$1
b=$2
op=$3
echo \* is *
if [ $op = "+" ];then
echo $a + $b = `expr $a + $b`
elif [ $op = "-" ];then
echo $a - $b = `expr $a - $b`
elif [ $op = "x" ];then
echo $a \* $b = `expr $a \* $b`
elif [ $op = "/" ];then
echo $a / $b = `expr $a / $b`
else
echo "operation is not supported!"
fi
结果:
[aaa@bbb sh-dir]$ ./calc.sh 10 2 +
shell脚本:计算加减乘除。文件名称:./calc.sh
输入+,-,x,/
格式示例:sh calc.sh 10 2 +
* is calc.sh first.sh second.sh test.sh third.sh times.sh
10 + 2 = 12
[aaa@bbb sh-dir]$ ./calc.sh 10 2 -
shell脚本:计算加减乘除。文件名称:./calc.sh
输入+,-,x,/
格式示例:sh calc.sh 10 2 +
* is calc.sh first.sh second.sh test.sh third.sh times.sh
10 - 2 = 8
[aaa@bbb sh-dir]$ ./calc.sh 10 2 x
shell脚本:计算加减乘除。文件名称:./calc.sh
输入+,-,x,/
格式示例:sh calc.sh 10 2 +
* is calc.sh first.sh second.sh test.sh third.sh times.sh
10 * 2 = 20
[aaa@bbb sh-dir]$ ./calc.sh 10 2 /
shell脚本:计算加减乘除。文件名称:./calc.sh
输入+,-,x,/
格式示例:sh calc.sh 10 2 +
* is calc.sh first.sh second.sh test.sh third.sh times.sh
10 / 2 = 5
问题:用 * 表示 乘号 ,作为输入参数时
输入命令:sh calc.sh 10 2 *
脚本处理 * 有问题,暂未找到合理解决办法,菜鸟一个。。。,只能用小写 x 代替
如脚本中 echo \* is *
输出结果:* is calc.sh first.sh second.sh test.sh third.sh times.sh
请大神指教。