Shell file contains

Like other languages, the Shell can also contain external scripts. This can easily encapsulate some common code as a separate file.

The syntax format contained in the Shell file is as follows:

. filename   # 注意点号(.)和文件名中间有一空格

或

source filename

Example

Create two shell script files.

test1.sh code is as follows:

#!/bin/bash
# author:php中文网
# url:www.php.cn

url="http://www.php.cn"

test2.sh code is as follows:

#!/bin/bash
# author:php中文网
# url:www.php.cn

#使用 . 号来引用test1.sh 文件
. ./test1.sh

# 或者使用以下包含文件代码
# source ./test1.sh

echo "php中文网官网地址：$url"

Next, we add executable permissions to test2.sh and execute:

$ chmod +x test2.sh 
$ ./test2.sh 
php中文网官网地址：http://www.php.cn

Note: The included file test1.sh does not require executable permissions.