简单基础的shell脚本标准开头信息
#/bin/bash
#===============================================
#FILE:文件
#USAGE:用法
#DESCRIPTION:描述
#OPTIONS:选项
#REQUIREMENTS:要求
#BUGS:已知错误
#NOTES:备注
#AUTHOR:作者
#ORGANIZATION:公司或组织
#CREATED:创建时间
#REVISION:修订版
#==============================================
显示时间：time=$(date '+%Y/%m/%d %H:%M:%S')

user@Ubuntu:~$ ./8.4.1.sh
./8.4.1.sh: please wait....10+0 records in
10+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.0844163 s, 1.2 GB/s
...done.

user@Ubuntu:~$ ./9.1.4.sh
Input a email,Please:[email protected]
This email address looks fine:[email protected]

user@Ubuntu:~$ ./command.sh
Backup utility
Usage: command.sh {sql|sync|snap}
sql : Run MySQL backup utility.
sync : Run web server backup utility.
Input a command,Please:sync
Running backup using rsync tool...
shopt -s nocasematch # 打开Bash的开关，忽略大小写
参数：-u关闭

user@Ubuntu:~$ ./connand.sh one two there
Listing args With $*:
Arg #1 = one
Arg #2 = two
Arg #3 = there