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Creating a Function function name { commands } or name() { commands } Function Return...

If Statement If the exit code of command is 0, then execute the content of then. if command then...

How to pronounce this name is quite curious, searched it, and someone even made a collection, oh ...

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The first process of the system, with a process ID of 1. ps -p 1 PID TTY TIME CMD 1 ?...

Basic Concepts A pipe can use the output of one command as the input of the next command, repres...

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Basic Concepts A file descriptor (FD) is an integer identifier used to represent an open file or...

Account /etc/passwd Linux uses the /etc/passwd file to store user account information. Because m...

Relationship Primary Group When a user is created, a group with the same name is also created, w...