Linux basic commands

Source: Internet
Author: User
Tags aliases sub command

Linux command  su: Switch account Note: When there is a # symbol, this is the superuser; when there is a $ sign, this is the normal user  cd: Enter the specified directory LL: Vertical display directory content ls: Horizontal display directory content LS- RTL: Sort by Time (ascending) Ls-tl: Sort by Time (descending) PWD: View current absolute path Date: View system time Date-s ' 2017-02-11 12:12:12 ': Modify system time Touch-t ' 201702021200 ': Modify the file time  1. Query class A. Query for System Information uname-a: View kernel version getconf long_bit: View system bits DF: View current system disk size free: View system memory Information LSCPU: View CPU-related information df-l: Display disk    Mount information fdisk-l: Viewing partition information mount: Load file unmount: Uninstall file fdisk: Format file (Caution) Tail-f: Refresh log in real time   last-x: View User Login History id+ user name: View Current User information WhoAmI: Query who is currently logged on who: query the current logged in user's information w: Query the details of the currently logged-on user  -help: information used to display some tools (e.g. LS--help) man ls: (list directory    Contents) See instructions for using "LS" instructions, man+ unfamiliar instructions, this feature can help us to quickly understand unfamiliar commands   history: Show previously used commands history-c: Clear historical record clear: Clean screen   Alias: View display aliases Unalias: Aliases   PS directive: ps-e: View all static processes Ps-ef: Show verbose static process Ps-ef|grep sshd: Filter out specific process 1234, service start Dynamic status isof-i:80 Query 80 port Service status, process status, top: Dynamic View process top-d 5: Refresh process every 5 seconds   du-m: View file size in megabytes (c bytes, K kilobytes, M Mega, G)   LS instruction (list Directory contents list contents): Ls-lth ll-h: Displays the current targetRecord all file size ls-a: Query All the files in the current directory, including hidden files ls-l: Query the current directory of files (without hidden files), available shortcut keys "ll" find command (exact lookup): Find/-name Hello: Exact Find file name is hello file Find/-iname H: Case-insensitive search for files with "H" Find/-size +1m: Full lookup of files larger than 1 megabytes (C-byte, K-Kbytes, M-Mega, G), less than "-", equal to no sign of add/subtract symbol Find/t Ype d: Search by directory (d: File F: directory) Find/-ctime-1: Full find files with a creation time of less than 1 days (-atime,-ctime,-mtime) (acesstime,creatime,modifytime) Find/-pe RM 644: Search for Find/-mtime by 644 permissions: + 1: Search by Time (+ 1: One day ago) view file Instructions Cat: View file contents more Duoceshi (file): View file duo content less Duoceshi: View the file duo content ( can be transferred up and down)  wc-l duo: Statistics file duo content Wc-c duo: Statistics file duo content rows nl Duo: line display file duo Content head-5 duo: Show file duo Top 3 lines tail-5      Duo: Show file duo 5 lines tail-f duo: Real-time Refresh file duo (used when viewing logs)    RM instruction: RM B (file): Delete b file rm-r xp (folder): Need to confirm continuously when deleting folder Rm-fr XP (folder): Direct and forced deletion, please use it carefully, once deleted difficult to reply to mkdir instructions (make directory): mkdir: Create a folder, the default owner of the folder is root mkdir a b C: simultaneously create a few Files Mkdir-p a/b/c: Create a contiguous directory rmdir xupan (file): Delete Xupan folder, and Xupan must be empty MV: Move or rename cp: Copy useradd Lichao: Add a new user, default owner group is LIC Hao Useradd lichao-g xp-g xpddx: Create user "Lichao"and specify the basic group "XP" and the group of "XP", "Xpddx" Userdel Lichao: Delete user passwd Lichao: Modify user Lichao password secret stored in:/etc/shadowcat/etc/passwd: Find All Users User stored in:/etc/passwdcat/etc/passwd |grep ' Lichao ': Find user ' Lichao '   chmod u=rwx keji Master permission changed to rwx chmod g=rw,o= Rx Keji Group Permissions change to RW other permissions to rx chmod a=rwx keji All permissions are changed to rwx chmod u-x Keji minus master permissions Chmo D a+x keji all plus permissions chmod ug+w,p-x keji Add and Subtract permissions rwx: Available 644 instead of CHOMD: Modify file (directory) permissions Chown Lichao A: Change the owner of a (file or directory) to ' Lichao ' Chgrp Lichao A: Modify the Group A (file or directory) to ' Lichao '   compress extract command: TAR-CVF duo_10.tar duo: Compress file or directory duo to DUO_10.TARTAR-XVF Duo_ 10.tar: Unzip DUO_10.TARTAR-ZCVF duo_10.tar.gz duo: Compress file or directory duo to DUO_10.TAR.GZTAR-ZXVF duo_10.tar.gz: Unzip Duo_10.tar.gzgzip Duo: Compressed file duo to duo.gz format gunzip Unzip zip file duo.gzzip duo: Compressed file or directory duo for format unzip Unzip file or directory   Ln-s KJ linkkj: Create a soft link to kj file if kj (file) is lost, then linkkj fail ln: Hard link ps-ef: View process Kill 1234: Close process 1234kill-9 1234: forcibly kills process 1234&N BSP;RPM-IVH mysql*.rpm: Installing the MYSQL.RPM package RPM-UVH MYSQL*.RPM: Upgrade mysql.rpm Package Rpm-aq: Query rpm Package   VI Editor: s/i/o/a: Enter Edit Status chrl+c: Exit edit yy+p: line copy 5yy: Copy cursor under 5 line 5DD: Delete cursor under 5 lines D : Delete Row after DD: Delete Row zz/: Exit Save: Wq Save exit: wq! Save forced Exit: Q does not save exit: Set Nu: Sets line number: 9,15 w/duo copy this 9-15-line record to duo text: W/duo Copy all content records with duo text: R/duo Copy the contents of the duo file after the cursor: 1,5 > 1-5 Line Right Indent one tab (4 bytes): 1,5 >> 1-5 lines indent right two tab (8 bytes): abbr 9 duo temporary replacement: VSP duo this file compared to duo file (Vim Editor)/Find J backspace u undo. Repeat last action   remote transmitter: sftp: Enter password get: Receive text put: Send file   database: Database online installation 5.1:yum install MySQL yum install Mysql-server Set Password: mysqladmin-u root password ' 123456 '   ps-ef|grep tomcat: View Tomcat process boot status lsof-i : 8080: View 8080 port condition   Sub command: Yum install Lrzsz: File transfer   supplement: Init 0/halt-p: Shutdown now init 6 reboot: Restart Ifconfig eth0 3 netmask: Temporarily replace IP address service iptables STOP: Turn off Firewall service iptables start: Start firewall sservice iptables Status: View firewall status Iptables-l- N: View firewall filter Port  chkconfig iptables on: Permanently turn on the firewall chkconfig iptables off: Permanently shut down the firewall  service Networkmanager Restart: Network Manager restarts the service (when the network connection icon disappears)  service network RestarT: Restart the NIC service mysqld start: Start Mysqlserbice mysqld stop: Close mysql pkill-9 java: Stop all Java process commands   View current language: Echo $ lang   mstsc        

Linux basic commands

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