Basic Command Boot Chapter

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Learn Linux, skilled operation of the basic command is the premise, often the basic command is the need to deeply remember into ventricles nautical mile. Below, is my Linux basic command boot, guide me to record the use of the basic commands.

Directory

An elegant sentence that takes you to the ocean of Linux commands:

• A year from now , and you'll wish you had started today.  

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General format: # COMMAND OPTIONS ARGUMENTS

COMMAND: Command

• Initiating a command: Requests that the kernel run a binary program as a process;

• The command itself is an executable program file: A binary format file that may invoke a shared library file;

• Most system program files are stored in:/bin,/sbin,/usr/bin,/usr/sbin,/usr/local/bin,/usr/local/sbin

General Command:/bin,/usr/bin,/usr/local/bin

Management commands:/sbin,/usr/sbin,/usr/local/sbin

Shared libraries:/lib,/lib64,/usr/lib,/usr/lib64,/usr/local/lib,/usr/local/lib64

32bits Library:/lib,/usr/lib,/usr/local/lib

64bits Library:/lib64,/usr/lib64,/usr/local/lib64

Note: Not all commands have a executable program file that corresponds to a directory

The commands are divided into two categories:

Commands that are brought in by the shell program: Built-in commands (BUILTIN)

Standalone executable program file, file name is command name: external command

Shell program is a unique program, responsible for parsing the user-supplied commands;

Environment variables:

Path: The path from which to find the command file for the command string that the user typed;

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Basic Command Boot Chapter