Hadoop diary Day6---common commands for Linux

First, the system operation (boot, shutdown, landing, etc.) command

Option name	Use formatting	Meaning
Reboot	Enter the carriage	Restart now
Shutdown	Shutdown–r now	Restart now
	Shutdown–r 20:35	20:35 restart
	Shutdown–r 10	Restart after 10 minutes
Halt	Enter the carriage	Shut down now.
Shutdown	Shutdown–h now	Shut down now.
	Shutdown–h 20:35	20:35 Turn off the machine
	Shutdown–h 10	20:35 Turn off the machine
Exit	Enter the carriage	Exit

Second, file directory operation

Option name		Use formatting		Meaning
Cd		CD [DirName]		Jump directory to DirName
DirName As the path name	Absolute path	A path name that begins with "/", such as/root	Cd/root	Jump to the root directory that is your own homedirectory
		There are C disk D drives under Win7, but Linux has only one root directory-"/", while "~" represents the user's home homedirectory, i.e. "/" + "user" record
		"/" root directory Top level	CD/	Jump to the root directory, which is the top level directory
	Relative path	“.” or null character	CD. or CD	Jump to current directory
		“..”	Cd..	Skip to top level directory
		"~" or "~/"	Represents the Host Directory	/root/file=~/file
		~	CD ~	Jump to HomeDirectory
Pwd		Pwd		Show current path name
Ls		Ls–a		All files listed under the directory include hidden
		Ls–l		List the details of a file
		Ls–f		Viewing files in a directory
ll		LL's not an order, it's Ls-l's nickname.		List the details of a file
Mkdir		mkdir Dir1		Create a directory called ' Dir1 '
		mkdir Dir1 Dir2		Create two directories at a time
		Mkdir-p/tmp/dir1/dir2		Create a directory tree
Rm		Rm-f file1		Delete a file called ' File1 '
		RM-RF Dir1 Dir2		Delete two directories and their contents at the same time
		RM-RF Dir1		Delete a directory called ' Dir1 ' and delete its contents at the same time
RmDir		RmDir Dir1		Delete a directory called ' Dir1 ', can only delete empty directory, cannot delete directory with files
Mv		MV Dir1 New_dir		Rename/move a directory Dir1 to New_dir
Cp		CP file1 File2		Copy a file content to File2
		CP dir/*.		Copy all files under a directory to the current working directory
		Cp-a/tmp/dir1.		Copy a directory to the current working directory
		Cp-a Dir1 Dir2		Copy a directory
More, Cat		more filename or cat filename		View File Contents
Stat		Stat filename		View file status
Tar		TAR–XZVF xxx		Unzip the file

Third, permission operation

Option name	Use formatting	Meaning
chmod	chmod [-R] nnn file or directory	Modify permissions for a file or directory
Chown	chown [ options ] User [   . Group ] file/dir	Modify the owner of a file
Chgrp	Chgrp [-R] Group name Dir/file	Modify the owning group of a file

Iv. Systems and Networks

Option name	Meaning
passwd xxx	Change Password
Df-ah	View disk space
Ps-ef |grep	View process
Kill-9	Kill the process
Vi/etc/profile	modifying environment variables
Vi/etc/sysconfig/network Vi/etc/hosts	Modify Host Name
Vi/etc/sysconfig/network-scripts/ifcfg-eth0	Modify IP Address
Service Iptables Stop Chkconfig iptables off	Shutting down the firewall
Setenforce Permissive Modify/etc/selinux/config	Turn off SELinux
passwd xxx	Change Password

Hadoop diary Day6---common commands for Linux