$(cd "$(dirname "$0")",pwd) 解析

xx.sh 文件内容如下：

#!/bin/bash
BIN_FOLDER=$(cd "$(dirname "$0")";pwd)
echo $BIN_FOLDER
PROJECT_FOLDER=$(cd "$(dirname "$BIN_FOLDER")";pwd)
echo $PROJECT_FOLDER
PYTHON_BIN=$PROJECT_FOLDER/.venv/bin/python
echo $PYTHON_BIN

BIN_FOLDER = $(cd "$(dirname "$0")",pwd) 解析：

1、取当前运行脚本的所在路径：　$0

2、取当前脚本所在路径的父目录：　dirname "$0"

3、取返回的父目录的值：　$(dirname "$0")

4、cd到返回的父目录：　cd "$(dirname "$0")"

5、输出地址：　cd "$(dirname "$0")",pwd

6、取输出的地址，并赋值给BIN_FOLDER：　BIN_FOLDER = $(cd "$(dirname "$0")",pwd)