摘要： ss命令用于显示socket状态. 他可以显示PACKET sockets, TCP sockets, UDP sockets, DCCP sockets, RAW sockets, Unix domain sockets等等统计. 它比其他工具展示等多tcp和state信息. 它是一个非常实用、快速、有效的跟踪IP连接和sockets的新工具.SS命令可以提供如下信息： 所有的TCP sock... 阅读全文

摘要： Validating Network Address Configuration To verify the configuration of the network address, you need to use the ip utility. The ip utility is a moder 阅读全文

摘要： When using chmod -R o+rx /data , you set the execute permission on all directories as well as files in the /data directory. To set the execute permission to directories only, and not to files, use ... 阅读全文

摘要： Changing User Ownership To apply appropriate permissions, the first thing to consider is ownership. To do this, there is the chown command. The syntax 阅读全文

摘要： Because users group membership is defined in two different locations, it can be difficult to find out which groups exactly a user is a member of. A co 阅读全文

摘要： 1、用w命令查看当前系统登录的用户 USER —登录的用户名TTY —登录后系统分配的终端号FROM—远程主机名，即从哪儿登录来的LOGIN@—何时登录IDLE—空闲了多长时间，表示用户闲置的时间。这是一个计时器，一旦用户执行任何操作，该计时器便会被重置JCPU—和该终端（tty）连接的所有进程占用 阅读全文

摘要： 1、使用passwd命令锁定与解锁账号 2、使用usermod命令锁定与解锁账号 阅读全文

摘要： 1.passwd命令 2.chage -l命令 Showing Password Expiry Information with chage -l 如果时间小于（Minimum number of days between password change : 3），则不允许修改密码。 阅读全文

摘要： Configuration Files for User Management Defaults When working with tools as useradd, some default values are assumed. These default values are set in 阅读全文

摘要： Modifying the Configuration Files To add user accounts, it suffices that one line is added to /etc/passwd and another line is added to /etc/shadow, in 阅读全文