basename返回一个字符串参数的基本文件名称
dirname命令去除文件名中的非目录部分,仅显示与目录有关的内容
[root@devops ~]# dirname /data/nginx/conf/nginx.conf
/data/nginx/conf
[root@devops ~]# basename /data/nginx/conf/nginx.conf
nginx.conf

[root@devops ~]# basename –help
Usage: basename NAME [SUFFIX]
or: basename OPTION
Print NAME with any leading directory components removed.
If specified, also remove a trailing SUFFIX.

–help display this help and exit
–version output version information and exit

Examples:
basename /usr/bin/sort Output “sort”.
basename include/stdio.h .h Output “stdio”.

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