Shell one of the basic applications

输出可执行文件的文件名(输出文件名): echo $0

输出可执行文件的文件名(不输出路径):echo `basename $0`

通过一个脚本进行多种操作：

一个文件Calculation，进行文件名加减运算

#! /bin/bash
fileName=`basename $0`
if [ $fileName = "add" ];then
result=$[$1+$2];
elif [ $fileName = "minus" ];then
result=$[$1-$2];
fi
echo "The $0 result is $result";

然后进行一个链接

ln -s Calculation add
ln -s Calculation minus

加法运算
```
# ./add 2 1
# The add result is 3
```

减法运算
```
# ./munis 2 1
# The munis result is 1
```

特殊变量

参数计数:$#
所有参数:$*

参数列表:$@

#! /bin/bash
echo $#
echo $*
echo $@
 
for var in "$*"
do
echo "$* param is $var"
done
 
for var in "$@"
do
echo "$@ param is $var"
done

测试输出结果：

设置输入超时

#! /bin/bash
if read -t 5 -p "input:" input
then
echo "you input: $input";
else
echo "Timeout";
fi

Shell one of the basic applications

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