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File Descriptor
Basic Concepts A file descriptor (FD) is an integer identifier used to represent an open file or...
User Managerment
Account /etc/passwd Linux uses the /etc/passwd file to store user account information. Because m...
Group Management
Relationship Primary Group When a user is created, a group with the same name is also created, w...
File Permission
Composition Structure -rwxr-xr-- The first character indicates the file type: -：File, such as ...
Acess Control List
Access Control List (ACL) is a more flexible and fine-grained permission management mechanism, us...
Meme
Introduction
File System Types You can use the -T option of the df command to view the Type field. df -Th Fi...
Environment Variables
SHELL The current shell in use. printenv SHELL /bin/bash HOME The path to the user's home dir...
Shell Startup Process
Startup Methods The startup methods of Shell will affect the loading process of environment vari...
Shebang
Shebang is a special symbol in Unix and Unix-like operating systems, composed of the characters #...