Linux help, File basic operations, backup commands, VI Editor

Knowledge of Linux commands, help, basic file operations, backup commands,vi editor usage

1. Understanding Linux commands

1)thelinux command is complete with a class of functions, options complete specifically.

2) command ----Shell(command interpreter)----- Kernel (kernel) This is the command execution process;

Depending on whether the command is part of the Shell , the command is divided into internal commands and external commands , which are part of the shell and external commands are provided by the installation software.

3) General format of the command: command [ options ] [ parameters ]

"- Options", short format; "-- Options", long format, multiple short formats can be merged.

[]: indicates optional;{a|b|c}: indicates multiple selection

commands in Linux are strictly case-sensitive;

4) Common shortcut keys:

ctrl+c--> Cancel Abort command

ctrl+l--> Clear Screen

ctrl+a--> cursor moves to the beginning of the line

ctrl+e--> cursor moves to end of line

Ctrl+f--> move forward

Ctrl+b--> Move Backwards

Alt+.--> references the last parameter of the previous command

Tab--> , a tab -completion command or parameter, two tab -Displays all commands that begin with a letter

2. Help

1) Help for internal commands:

Help CD # # shows the cd commands

2) Help options for external commands:-h/--help

LS--help # # show ls command simple help

Useradd--help # # show Help for Useradd commands

3) Manual of the command: Man

A.man type of area:

1--> User Commands

format Help for 5--> configuration files

8--> Help for administrator management tools

Man Man # #man1 show Help for user command man

Man 5 vsftpd.conf # #man5 means view vsftpd 's profile help

Man 8 IP # #man8 view Help for Administrative Tools IP commands

the basic structure of B.man

Sections ( area )

Name(first name)

Synopsis(Syntax of the command)

Description(Description explanation command)

Option(options)

EXAMPLE ( used case, used )

Author ( author )

See also(Other related help)

Users often follow:name,synopsis,option,example

Man Route-->/example ( search )-->n ( view next ) - Find related configuration Case resolution forget Route command to configure routing.

C. tips for use:

Ctrl+f-- Turn one page forward

Ctrl+b-- Turn back one page

Q--> Exit

/ keyword -to-find, use the n key to find the next,n Find the previous

Man-k Command # # to find similar commands

4) software document(document):/usr/share/doc/

Linux help, File basic operations, backup commands, VI Editor