I. Management of the Document System
Tips: When you enter a command, you need to use the TAB key to complete
LS View directory information (LS/)
Ls-l equivalent to LL
PWD View the path that is currently in place
CD switch directory (CD/) and switch to user home directory without parameters ~
mkdir Create a folder
RmDir Delete Empty folders (only empty folders can be deleted)
Rm-r/a/b (Delete non-empty folder)
Create a file
Touch A.avi Create an empty file
VI blabla.txt Edit a file with a text editor and save
echo "Angelababy,zhen de hen Xihuan ni" > qingshu.txt put the left output in the file on the right.
deleting files
RM filename (rm-r Delete folder rm-rf Force delete file or folder)
Move file Modify file name
MV A/wenjian1.txt B/file1.txt (while moving the file also modifies the filename)
Copy files
CP Srcfile DestFile
View File Contents
Cat Wodeqingshu.txt
More wodeqingshu.txt can be divided into pages to see
Less wodeqingshu.txt not only can be divided into pages, but also can be easily searched, inverted and other operations
tail-10 Wodeqingshu.txt View 10 lines of the tail of the file
The log produced by the program has the special meaning of debug in production practice
Tail-f User.log Real-time refresh displays the tail of the file
head-20 wodeqingshu.txt View file's head 20 lines
Second, authority management
Drwxrwxr-x
Modify Permissions
chmod u+rwx file Adds or cancels the permissions of the owning user for file
(U on behalf of the user O on behalf of other user G on behalf of the group member users)
chmod 567 file with numbers can also represent permissions
5--->---> R-x
Modify the owner of the file owners owner
Chown hadoop:hadoop file to convert owner of file to Hadoop user, group to Hadoop Group
Permissions on the parent directory are also constrained to the operation of this level of files or folders
Third, user management
Add user
Useradd itcast0830
You must set a password to log on normally passwd itcast0830
Delete User
Userdel Yun12
Userdel-r Itcast Deletes a user's home directory while deleting a user-----
Modify User Properties
Usermod-l b A To change the landing name of A to B
Usermod-g Hadoop itcast0830 To change the itcast0830 group to a Hadoop group
Usermod-g Hadoop,root itcast0830 adds two groups to itcast0830 Hadoop,root
usermod-d/home/itcast itcast0830 convert itcast0830 home directory to/home/itcast
(To create the Itcast directory beforehand, and to copy the environment variable file)
----* * * *----Modify user's password
passwd itcast0830
Add User Group
G
Roupadd Beauties
Delete a user group
Groupdel Beauties
Modify User Group Properties
Groupmod
View the status of the current login
WhoAmI
View the groups that are currently in the genus
Groups
Iv. common system Management (all involved to modify, we must use root permissions)
****
It is easy not to use Su to switch to root identity
command for normal users to perform root permissions using sudo
For example, add a Hadoop user to the sudoers file
Root all= (All)
Hadoop all= (All)
Disk space Information View
Df-h View disk space status information
Du-sh * View total size of all subdirectories and files under current directory
Process Information View
Free View Memory usage
Top View system process information for real-time refreshes
Ps-ef View snapshot of process information in the system at the moment
Ps-ef | grep myshell.sh Search for Myshell process information
Kill-9 PID Kill Process (-9 for forced kill)
V. File archive Compression (1: Pack--archive; 2: Compress)
1, archiving
TAR-CVF Testdir.tar testdir/
2, compression
Gzip Testdir.tar
gzip file
bZIP file
TAR-CZVF testdir.tar.gz testdir/
TAR-XZVF testdir.tar.gz extract to current directory
TAR-ZXVF testdir.tar.gz-c downloads/extracted to the specified Downloads directory
VI. Network Management
Modify the configuration of an IP address
Vi/etc/sysconfig/network-scripts/ifcfg-eth0 Modify the profile to change the IP address
or use the Setup command to modify it with a hint pseudo graphical interface
View IP Address
Ifconfig
Modify Host Name
Vi/etc/sysconfig/network Modify the Hostname configuration entry
To take effect immediately, you can execute instructions hostname nidezhujiming
Hostname=yun12-01
IP address mapping of host name---management intranet
Vi/etc/hosts
192.168.2.250 yun12-01
Restart Network Services
Root permissions under Service network restart
Turn off Firewall service iptables stop
Turn off firewall auto start chkconfig iptables off
To modify the default boot level for a system
Vi/etc/inittab
# 0-halt (Don't set Initdefault to this)
# 1-single User mode
# 2-multiuser, without NFS (the same as 3, if you don't have networking)
# 3-full Multiuser mode
# 4-unused
# 5-x11
# 6-reboot (Don't set Initdefault to this)
#
Id:3:initdefault:
~
Start a fully functional character interface with level 3
View information for the current process connection network
Netstat-nltp
V. Common TOOL Instructions
WC statistic Text information (number of lines, number of words, number of characters)
Date and time to view or modify the system
Echo output string or value of variable
VI Linux System in the most common text editor
Vi. Software Installation in Linux
Jdk
Unzip the installation package to your installation path
Then modify the environment variable sudo vi/etc/profile
And then Source/etc/profile comes into force.
Tomcat
Eclipse
Mysql
Redhat Company's RPM approach package management is also a very common package Manager
Rpm-qa | grep MySQL
sudo rpm-e mysql-libs-5.1.66-2.el6_3.i686--nodeps
sudo rpm-ivh mysql-server-5.1.73-1.glibc23.i386.rpm
The above is a small set to introduce the study of Linux commonly used commands (recommended), I hope to help you, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!