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Condition
If Statement If the exit code of command is 0, then execute the content of then. if command then...
Linux Torvalds
How to pronounce this name is quite curious, searched it, and someone even made a collection, oh ...
ULIMIT
[todo]
Systemd
The first process of the system, with a process ID of 1. ps -p 1 PID TTY TIME CMD 1 ?...
Pipe
Basic Concepts A pipe can use the output of one command as the input of the next command, repres...
LSOF
[todo]
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 ...