echo $0echo `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
- 一个文件
- 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:
[email protected]#! /bin/bash echo $# echo $* echo [email protected] for var in "$*" do echo "$* param is $var" done for var in "[email protected]" do echo "[email protected] param is $var" done
- 参数计数:
- 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