2.1 Linux file and directory management 2.1.1 Absolute path: 2.1.2 Relative path: 2.1.3 Parent directory and this directory:
2.2 Common commands for handling directories 2.2.1 ls (list directories) 2.2.2 cd (change directories) 2.2.3 pwd (display the current directory) 2.2.4 mkdir (create a new directory) 2.2.5 rmdir (delete empty Directory) 2.2.6 cp (copy files or directories) 2.2.7 rm (remove files or directories) 2.2.8 mv (move files and directories, or modify names)
2.3 View the contents of Linux files 2.3.1 cat 2.3.2 tac 2.3.3 nl 2.3.4 more 2.3.5 less 2.3.6 head 2.3.7 tail
3 User and user group management
3.1 System user account management 3.1.1 useradd command to add new users 3.1.2 userdel command to delete accounts 3.1.3 modify accounts 3.1.4 passwd command user password management
3.2 Management of user groups 3.2.1 The groupadd command adds a new user group 3.2.2 The groupdel command deletes a user group 3.2.3 The groupmod command modifies the attributes of a user group
4 Disk Management
4.1 Three commonly used commands for Linux disk management 4.1.1 df 4.1.2 du 4.1.3 fdisk