Linux| Linux的.的使用

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[taoge@localhost Desktop]$ cat a.sh 
#! /bin/bash
echo "shell script"
export z="f(x) + f(y)"
[taoge@localhost Desktop]$ ./a.sh 
shell script
[taoge@localhost Desktop]$ echo $z

[taoge@localhost Desktop]$ . ./a.sh 
shell script
[taoge@localhost Desktop]$ echo $z
f(x) + f(y)
[taoge@localhost Desktop]$ 

注意: .相当于source命令

参考:
https://blog.csdn.net/stpeace/article/details/45588597