Shell变量是在Shell脚本中用于存储数据和临时存储结果的一种特殊变量。它可以用于存储字符串、数字和命令输出等数据。 在Shell中，定义变量的语法为：变量名=值，如： name="John" age=20 变量名..

In Linux, the /etc/group file stores information about user groups on the system. This file is a plain-text file and is typically located in the /etc directory. The /etc/group file contains one e..