“"的含义是什么.文件名" (时段空间文件名)在Bash中?
格式为[period] [space] [filename]的命令是什么意思?
What does a command with format [period][space][filename] mean?
示例:
. ./setup.sh
在.bashrc文件中，也有这样一行:
Also in the .bashrc file, we have a line like that:
. "$HOME/.bashrc"
这是什么意思?
.运算符也称为source.
根据此论坛主题，第一个.是命令source，用于从作为参数给出的文件名中读取和执行命令.
第二个.是当前目录.
According to this forum thread, the first . is the command source to read and execute commands from the filename given as argument.
The second . is the current directory.
. ./setup.sh
与
source ./setup.sh
或
source setup.sh
如果当前目录./在PATH环境变量中.
if the ./, the current directory, is in the PATH environment variable.
此处是该手册: http://ss64.com/bash/source.html
通常用于在当前shell中运行脚本，以帮助设置执行环境以及设置别名.
This is typically used to run the script in the current shell to help set up the environment for execution, as well as to set up aliases.