The most obvious way you could use join in the real world would be to pull the username and the corresponding home directory from the /etc/passwd file and the group name from the /etc/group file.
在实践中可以使用join 工具最明显的方法是从 /etc/passwd 中提取用户名和对应的主目录项，并从 /etc/group文件中提取组名。
Very surprisingly, /etc is a link to /home/etc.
令人惊讶的是，/etc是一个到 /home/etc 的链接。
Someone who works from home, and communicates with their employer, customers etc using a computer, telephone etc.
从家里使用计算机、电话等设备联系自己的老板和客户办公。
Applications: hospitals, schools, hotels, residences, offices etc. Disinfect the air and surface of goods. All kinds of home electric equipment is available. Applications health care, etc.
应用范围：应用于消毒柜、微波炉、空调美容美发器械等各种家电设备。医院、学校、宾馆、饭店、家庭、办公室的空气和物体表面的消毒杀菌。
Applications: hospitals, schools, hotels, residences, offices etc. Disinfect the air and surface of goods. All kinds of home electric equipment is available. Applications health care, etc.
应用范围：应用于消毒柜、微波炉、空调美容美发器械等各种家电设备。医院、学校、宾馆、饭店、家庭、办公室的空气和物体表面的消毒杀菌。
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