.: . filename [arguments]
. 文件名 [参数]
Execute commands from a file in the current shell.
在当前的shell脚本中加载一个文件执行里面的命令.
Read and execute commands from FILENAME in the current shell. The
在当前的shell脚本中加载一个文件读取和执行里面的命令.
entries in $PATH are used to find the directory containing FILENAME.
$PATH环境变量用于查找文件目录
If any ARGUMENTS are supplied, they become the positional parameters
when FILENAME is executed.
如果有形参，文件在被执行的时候实参就会传过去。
ps:(parameter=形参(formal parameter)， argument=实参(actual parameter)。)
Exit Status:
退出状态:
Returns the status of the last command executed in FILENAME; fails if
FILENAME cannot be read.
返回文件最后执行的命令的状态；如果无法读取文件返回失败。
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