70 Common Commands in Linux

The linux command is a command to manage the Linux system. For a Linux system, the commands of Linux system management are the core of its normal operation.

get help

help: View the help of linux built-in commands, the information displays a brief description of the query command and the use and description of some parameters

man: You can view information such as command help, configuration file help, and programming help through man.

System Basic Commands

ip addr: view ip address

date: View system time

logout: logout

shutdown now: shutdown

reboot: reboot

login : log in to the system

clear: clear the screen

whoami: Displays the current user name

File and directory operation commands

Is: list abbreviation, lists the content of the directory and its content attribute information

cd: change directory abbreviation, switch from the current working directory to the specified working directory

cp: copy abbreviation, copy a file or directory

find: find directories and files in directories

mkdir: make directories abbreviation, create a directory

mv: move abbreviation, move or rename a file

pwd: print work ina directory abbreviation, showing the absolute path of the current working directory

rename: rename the file

mkdir: create a new directory

rmdir : remove empty directories

rm-rf : delete one or more files or directories

touch : create a new empty file, change the timestamp flexibility of an existing file

file: Displays the type of the file

cat: view all the information in the file

more: Pagination to display file content

less: paging to display the contents of the file, the opposite usage of the more command

head: Displays the head of the file content

tail : display the tail of the file content

cut: split each line of the file by the specified F character and output

split: split the file into different small pieces

sort: sort the text content of the file

uniq: remove duplicate lines

wc: count the number of lines, words or bytes of the file

iconv: encoding format of the converted file

dos2unix: Convert DOS format files to UNIX format

grep/egrep: filter strings

join: merge by the same field of two files

vi/vim: command line text editor

tar: Manipulate tar.gz files

zip/unzip: compress/decompress zip files

rpm: manage rpm packages

yum: automatically download and install RPM packages from the specified server, install all dependent packages at once

User management commands

useradd: add user

usermod: Modify user attributes that already exist in the system

userdel: delete user

groupadd: add user group

passwd: change user password

chage: Change the validity period of the user password

id: View the user's uid, gid and the user group to which they belong

su: switch user identity

sudo: as another user (default root user)

network operation command

telnet: use the TELNET protocol to log in remotely

ssh: remote login using SSH encryption protocol

scp: copy files between different hosts

wget: command line to download files

ping: test network connectivity

ifconfig: view, configure, enable or disable network interfaces

netstat: View network status

ss: View network status

ftp: remote file transfer

Commands related to system permissions and user authorization

chmod: change file or directory permissions

chown: Change the ownership of a file or directory

charp: change file user group

umask : show or set permission mask

system management commands

top: Displays the program process in execution

df : View disk space usage

free: View memory usage

quota: View disk usage and restrictions

kill -9/-15: kill the process

crontab: Scheduled program execution

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