Linux Basic configuration and view command Help

Linux major distributions are Debian, Slackware, RedHat. which

Debian:ubuntu

Knoppix

Slackware:s.u.s.e

OpenSuSe

Redhat:fedora

Centos

We study mainly in the CENTOS7 version of the main, download link http://isoredirect.centos.org/centos/7/isos/x86_64/CentOS-7-x86_64-Everything-1611.iso.

Select Http://mirrors.163.com/centos/7/isos/x86_64/CentOS-7-x86_64-Everything-1611.iso.

Install with virtual machine (VMWARE12), detailed installation steps do not describe, note the points:

1. Network mode select bridging mode.

2. Configure the network:

(1) cd/etc/sysconfig/network-scripts

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(2) vi ifcfg-ens33, the Onboot "no" to "yes", the last input: Wq save and exit, and then restart the network 650) this.width=650; src= https://s1.51cto.com/wyfs02/       M02/8f/8a/wkiom1jkdepinziuaabnhdz5uua365.png "title=" 1.png "alt=" Wkiom1jkdepinziuaabnhdz5uua365.png "/> (3) Restart Network Command # Service network restart

3. Make sure the firewall is off:

(1) iptables-l-N View firewall rules

(2) Iptables-f Clear firewall rules, currently valid

(3) Systemctl Stop firewalld.service Temporary prohibition rule

(4) Systemctl Disable Firewalld.service Permanent prohibition rules

4. Use the system via Xhell remote connection (because the mouse directly using the virtual machine loses focus and needs to be Ctrl+alt switched out).

To complete the above steps, log in to the system with the following interface:

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[email protected] ~]#

Root: currently logged in user

localhost: Host name of the current host, non-full format

~: User's current directory, also known as working directory

#: Command Prompt

#: Administrator account, root, with maximum permissions, can perform all operations

$: Normal user, non-root user

Syntax common format for Linux commands:

~]# Command Options arguments

Command option Parameters

The commands are divided into two categories:

commands from the shell program, also called built-in commands

Standalone executable program file, file name is command name, also known as external command

View command type: Type command (built-in or external command)

Get help with using the command:

Internal command: Help command

External command: (1) command use Help with a brief format

#command--help

(2) User manual

Manual path:/usr/share/man/

#man command

The user manual is a compressed file, with sections such as

The/usr/share/man/directory has man1, man2 、......

1. User commands: Commands that can be used by both ordinary users and administrators

2. System calls

3.C Library Call

4. Equipment files and special documents

5. File format (configuration file format)

6. Game Use Help

7. Miscellaneous

8. Management tools and Daemons

Note: Not every command has a manual under all chapters

The man command to open the manual after the operation method:

Flip Screen: Space bar to the end of the file to flip a screen

B: Flip a screen to the file home page

Ctrl+d: Turn half screen at the end of the file

Ctrl+k: Turn half screen to file header

Enter: Flip a line to the end of the file

K: Flip a line to the file header

G: Jump to the last line

#G: Jump to a specified line

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Linux Basic configuration and view command Help