Summary of several basic commands

1, after the VMware login to the Linux system succeeds, it will show the following form:

[Email protected] ~]#

Where # is the command prompt that shows the current user is an administrator (root), the prompt for a normal user is $

 , command format:

COMMAND [OPTIONS ...] [ARGUMENTS ...]

Options: One or some of the features used to enable or disable commands. Options are divided into short options and long options:

Short options:-C For example:-L,-H

Long options:--word For example:--all,--color

Parameters: The object of the command, such as file name, user name, etc.

Note: 1, multiple options, and multiple arguments and commands are delimited by using white space characters

2, Cancel and end command execution can be used: Ctrl + C, ctrl+d

3, multiple commands can be separated by (semicolons)

4, a command can be divided into multiple lines with \

# Ctrl+alt+f#[1-6] switchable Terminal Login interface

2, there are two types of commands that can be executed in the shell:

Internal command: Delivered by the shell, and provided by a command, enable or disable internal commands

External command: In the current system of a file system path has a corresponding executable program file, the Which,whereis command can be used to query the path of the command, the command format is as follows:

# which COMMAND

# Whereis COMMAND

The difference between the currently used command is an internal or external command

# type COMMAND

3,LSCPU command: Can view the information of the native CPU

4,cat command: Can view the contents of the file

5,who command: To view the currently logged on user

6,who am I command: can view the currently logged on user

7,poweroff, Halt, Init0: Power off

8,hostname command: View current host name

# hostname

#hostname new_name Modify Host Name

9,tty command: Displays the terminal of the login

10,ifconfig command: View current network status

11,free command: View memory usage

12,history command: View and save History commands

13,hash Command: Search for external command path results cache to KV (key-value) storage

14,uname command: Displays the current operating system name

Function Description: Uname is used to obtain information about the computer and the operating system.
Syntax: uname [-amnrsvpio][--help][--version]
Supplemental Note: uname can display basic information such as the version of the operating system used by the Linux host, the name of the hardware.
Parameters
-A or –all verbose output all information, followed by kernel name, hostname, kernel version number, kernel version, hardware name, processor type, hardware platform type, operating system name
-M or –machine displays the hardware (CPU) name of the host
-N or-nodename displays the name or host name of the host on the network node
-R or –release display Linux OS kernel version number
-S or –sysname displays the Linux kernel name
-V display shows the version of the operating system
-P display processor type or unknown
-I display hardware platform type or unknown
-O Display Operating system name
Help Get Help information
–version Display uname version information

Summary of several basic commands