Linux basic commands

Shutdown-h now immediately shuts down the machine

Shutdown-r now restart your computer

Reboot restart your computer now

Logout Log off users

Use of the VI Editor:

1) VI File name

2) input i "Enter command mode"

3) Enter ESC "Enter Command mode"

4) Enter: "Wq means exit hold q! Exit Do not save"

PWD Displays the current path

Groupadd polic Add polic user Group

To view information for all groups in Linux:

Vi/etc/group

Cat/etc/group

View all user information in Linux

vi/etc/passwd

cat/etc/passwd

Useradd xiaoming Add xiaoming user "Add user only user with root privileges can"

USERADD-G Group name User name add users and specify user groups at the same time

passwd add a password to the current user

passwd xiaoming to xiaoming user to change password

Userdel xiaoming Delete User xiaoming

Userdel-r xiaoming Delete User xiaoming and user's home directory

Command: init [012356]

Run level

0: Turn off the machine

1: Single-user mode

2: Multi-user status No NETWORK service

3: Network Service with multi-user status

4: System not used reserved to user

5: Image Interface

6: System restart

The common run level is 3, 5, to modify the default RunLevel to modify the Id:5:initdefault of the file/etc/inittab: The numbers in this line

LS Lists files and directories

-A Show hidden files

-l Display long list format

mkdir Building a Directory

RmDir Delete Empty Directory

Touch to create an empty file

CP Replication

Cp-r dir1 dir2 Recursive copy command

MV moving files and changing file names

RM Delete files and directories

RM-RF Delete all content (including directories and files)

R Recursive F Force

More display file contents with pagination

Less displays the contents of the file with pagination

grep queries a keyword in the text

For example: Find the Xiaohong keyword in the file file.txt file: grep "Xiaohong" file.txt

If you also want to display the number of rows that the Xiaohong keyword appears: grep-n "Xiaohong" file.txt

| The pipe command "gives the result of the previous command to the following command for processing"

Find search files and directories

Find/home-name AAA starting from/home search for files and directories named man

Search for files or directories that have been accessed or changed over time

find/home-amin-10 directories or files accessed within 10 minutes

find/home-atime-10 directories or files accessed within 10 hours

Find/home-cmin-10 a directory or file that has changed within 10 minutes

Find/home-amin-10 a directory or file accessed 10 minutes ago

Search for files of a specified size

Find/home-size +10k to find files of size 10k in the/home directory

>, >> redirect command:

Ls-l > A.txt The contents of the list are written to the file A.txt (overwrite write)

Ls-al >> Aa.txt The contents of the list are appended to the end of the file Aa.txt

Databse < Database_data entering information from a file

Chown User name File name modify file owner

CHGRP Group name File name modify the group in which the file is located

Mount Command:

Mount [-parameters] [device name] [Mount Point]

Uninstall command:

Umount [device name]

To view disk usage:

DF [-parameter]

To see which partition a directory is in:

DF [Directory full path]

View Linux system partition specifics:

Fdisk-l

RPM Package Installation:

Rpm-i PRM Package Full path name: Install package to current system

RPM-IVH RPM Package Full path name: Install package to current system with prompt information

I:install Installation

V:verbose Tips

H:hash progress bar

RPM Delete:

RPM-E RPM Package Name

If other software depends on the package you are uninstalling, an error message will be generated when uninstalling.

Use the --nodeps command-line option if you want RPM to ignore this error and continue uninstalling (Programs that depend on the package may not run).

Linux basic commands