Linux Learning Notes

Cal display Specifies calendar Cal 4 2016

ls file in current directory

Date Display Time Month day

Date +%y-%m-%d 2016-07-30

Date +%h:%m 18:46

BC Enter calculation

Scale=3 three digits after decimal point quit

TAB auto-complete cat xxx (enter to fill) view file contents TAC XXX Reverse View file contents

CTRL + C End current

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Ifconfig enp0s3 192.168.1.105 Modify the IP of the Linux network card

Ifconfig ENP0S3 up/down Switch card

Ifconfig enp0s3 View NIC status

Ifconfig enp0s3 netmask 255.255.255.0 Modify the subnet mask

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Ls-l/home/wanglianchen Lists all folders in this directory

Ls-la list all files (including hidden files)

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Man LS displays all commands for LS

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CD back to the user home directory CD. Back to the top level directory

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Su-wanglianchen PWD Displays the current user directory/home/wanglianchen

Su-root Switch User pwd Displays the current user directory/root

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New file (file action)

Touch Tail.txt New File

mkdir XXX Create Folder

Mkdir-p a/b/c Creating a multilevel directory

RM xxx.txt Deleting files

rm-r XXX Delete Directory

Rm-f Xxx.txt forcibly deleting files

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CP xx1 XX2 Copy the xx1 to xx2 (copy) MV Xx1/home move the xx1 file to the home directory

Redirected output ls > 123.txt write the LS list to a 123.txt file (overwrite instead of append) ls >> 123.txt append ls to 123.txt text ls 2> 123.txt writes error message to 123.txt text E Cho "abc" >>123.txt

REDIRECT Input grep xxx < 123.txt find in 123.txt XXX content vi 123.txt edit Text Press ESC input Colon W write file Q exit Edit: W:q

Wc-l 123.txt Statistics rows WC 123.txt output lines + Word count + characters

Ln-s/tmp/1.txt T Create a new shortcut in the current directory point to Tmp/1.txt Soft connect ln-s/tmp/packaging.log t

Echo echoing command can be used to empty file contents echo > Tail.txt

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Clone a new terminal tail-f tail.txt This command can monitor changes in the contents of the Tail.txt file (-F is used to swipe the screen)

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Find/-name profile finds files named profiles under the root directory

Cat Xxxprofile |grep xxxcontent find xxxprofile files with xxxcontent content

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Process-related

PS process-related Directives ps-a Show All Processes Ps-ef Show all process details Ps-ef |grep python Search Cable Python process Ps-aux |more

Stat xxxx display file Zodiac equals right-click Property

Hostname display host name hostname XXX Change host name Uname-a current system Properties kill-9 5809 5809 Process number

Netstat-ano |more to view native IP and external IP

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Service-related issues

Services sshd Restart Restart SSH Service chkconfig view service status server iptables stop stop iptables Firewall service

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Backup and compression

TAR-CZVF XXX.tar.gz 123.txt The 123.txt compressed file is named XXX.tar.gz Gz=gzip

C: Create Z: Compact protocol F: Show file manifest V: Display the file TAR-XZVF tard.gz extract

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Vim Editor

Tapping the I key into the edit mode o key the current line goes to the next line to append a row shift+o the previous line of the current row

Tap ecs/xxx text to find XXX again press n back query next n forward query

s/p1/p2/g P2 replace P1 (current line) N1,n2 s/p1/p2/g N1 row to N2 row P2 replace P1 g/p1/s//p2/g all P1 replaced by P2

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Manage users

Who shows all users under current Linux (check)

Who am I show user I logged in

Useradd wanglc-d/home/wanglc-p 123-g User (add) Create users WANGLC user Directory/HOME/WANGLC

"' Secret ' ' ' 1 ' ' 2 ' 3 '" "U ' ser (not specified group-G XXX default to private group) Userdel WANGLC (delete) passwd Usernam e Modify user password (change)

Groups display user user groups

User information is stored in the/etc/passwd file cd/etc cat passwd Cat Shadow

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Manage File permissions

chmod 777 xxxx Root can use chmod to manage file permissions read R (4) write W (2) Run X (1) 777 for readable

Writable to run

Chown wanglianchen:wanglianchen t.txt Change t.txt file to user wanglianchen: User group Wanglianchen belongs to

Chown-r Wanglianchen:wanglianchen A changes All files in the a directory to user wanglianchen: The user group Wanglianchen belongs to

-R: Recursively chgrp all subdirectories to change group permissions

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Pipe: The output of the previous command as input to the next command

ll |wc-l will query to the LL list count rows

Cat 123.txt | Sort-n |uniq >>123.txt The contents of 123.txt in (n) numbers (sort) Uniq duplicate lines not displayed (>>) append to 123.txt text

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Tr ' A-Z ' A-z ' uppercase turn lowercase

Vi. bash_history viewing user-executed command history

Vi. bash_profile Viewing environment variables can be modified if you modify an environment variable, you need to

The source. Bash_profile command makes the. bash_profile file Effective

echo $JAVA _home view JAVA environment variables

ENV View Environment variables

SH xxx.sh Execute shell script

Linux Learning Notes