Linux basic commands

Here are some of the notes I learned about Linux, as summarized below

First of all to popularize common sense: DNS is used to resolve the domain name, the URL port default is 80, can not write, localhost is 127.0.0.1, if it is root, the prompt is: #, the average user is: $;

Common Commands under Linux:

1. Check the current system login user, you can enter the WhoAmI command, if you want to see the total number of users under the system, can be viewed under the/home path;

2. To view the current system IP information, you can enter IP A,

3. Modify the temporary IP address, you can enter the Ifconfig eth0 169.254.*.*, but the restart after the failure;

4.netstat-nlpt|grep 80 to see if the port number is occupied;

5.ps-ef|grep MySQL ps-ef find process grep displays matching lines in the file; Ps-ef|grep httpd |grep-v "grep"-V means to exclude the grep process; PS is instantaneous, top is dynamic

6. Environment Variables When modifying environment variables, remember to write $PATH:, I was on the Linux installed Tomcat when I forgot to write $path:, causing the system to start an error,

7.cd.. Go back to the top level directory, CD. /..  /.. Go back to Level three, CD-go back to the last operating directory and know that these commands are much more convenient when you switch directories back and forth.

The 8.SCP command is a copy of the transfer file between two machines, which refers to a Danale blog to introduce, http://www.cnblogs.com/peida/archive/2013/03/15/2960802.html personal feeling written very good!

9. File permission Description: Dr-xr-x---D is a directory, if this location is-, indicates that the file ' R-x ' represents the user's rights, the second ' R-x ' represents the permissions of the group, the third group '---' represents the rights of other users, you can use the chmod command to empower. Personal feeling chmod command of the digital way more convenient, [n][n][n] r=4 w=2 x=1, such as rwx=4+2+1;

10.linux Learning method is more practice, more real exercise, the common command to remember, more practice more summary to progress!

11. As a novice to learn Linux, be sure to remember to modify the configuration file to be backed up, remember!

Linux basic commands