Several Linux commands

Common Linux commands:

General user commands:

I. File and directory view class commands 1. LS (Common Parameters-L and-H)

Blue color: Indicates directory

Green color: Represents an executable file

Red color: Indicates compressed file

White color: Indicates normal file

Cyan: Indicates a linked file

Ls-l: Displays all files and folders under the current folder using a list

Lists primarily include the file's permission bits and file owners

Ls-l-H

Normally the-l parameter needs to be used with the-H parameter (when the file size is displayed using K or M)

2.cat command (for displaying file contents)

3.PWD command: (for displaying the current path)

ii. file and Directory management class commands 1.chmod Command (to modify the file's permission bit)

Description of the file's permissions:

The start bit represents a file attribute: (d: Represents a directory;-represents a normal file)

Next every three characters in a group (a total of three groups): (r: Indicates Read permission) W: Indicates write (writable permission) x: Indicates executable permission)

Note: For normal file x means executable, for directory x means you can use LS to view the contents of the directory

First Group: User rights

Second group: Permissions for the group in which the user resides

Group Three: Permissions for other users

To add writable permissions to a user group:

View:

Subtract user group permissions:

View changes to:

2.CHGRP command: (for modifying the owner of a file, including the file owner and the group in which the owner resides)

three. System Information view class commands (view system-related information) 1.who (used to see which users are currently logged on to the system)

2.date command (for output current time)

3.ps command: (for displaying the current process)

PS Default only shows the processes created by the current user

Show system all processes use PS-E to list all processes in the system

PID: Process ID Number

TTY: Indicates which terminal the process is working on

Time: When the process was created

CMD: Which program created the process

4.kill command: (used to kill a process)

Kill 3494 Processes

Have killed

5.uname command (for displaying machine names)

UNAME-A (Display system Information complete parameters)

Super User command: (Superuser can use all commands of normal user)

1.ifconfig Command (for NIC configuration)

Shows the configuration of the current machine card without any parameters

ETH: Linux is a naming convention for network cards, and Eth0 represents the first NIC

Lo: is a return device, which is a kernel virtual appliance

Add an IP address, plus a subnet mask

2.fdisk command (for disk partitioning) (use sparingly)

Fdisk-l Viewing partitions

3.modprobe (Load OS kernel module or driver)

4.lsmod (view system kernel module)

The kernel modules that the kernel has loaded are listed below

Module: Modules Name

Size: Sizes

Used by: Which other modules are used by this module

Several Linux commands