$0
[yeyusheng@bogon Desktop]$ echo $0
/bin/bash
basename $0
[yeyusheng@bogon Desktop]$ basename $0
bash
$0
[yeyusheng@bogon Desktop]$ echo $0
/bin/bash
basename $0
[yeyusheng@bogon Desktop]$ basename $0
bash
原文：https://www.cnblogs.com/yeyusheng/p/8135807.html