Searching and Installing packaages on Centos
yum search jdk
This will find out all available package with name jdk
yum install java-1.6.0-openjdk
This will install package java-1.6.0-openjdk
To See all running services
ps -Al
ps -a
This is like task manager of windows. It will show all proccess being running in console
Download file/folder from internet
lwp-download http://www.perl.com/CPAN/src/latest.tar.gz
and
wget http://www.perl.com/CPAN/src/latest.tar.gz
This will download latest.tar.gz from given url
Create and Edit file
vi filename
saving file
ESC + : +wq
Quit without saving
ESC + : q!
Creating folder
mkdir foldername
Deleting file
rm filename
rm file1 file2 ------ deleting multiple files at a time
Deleting folder
rm –rf foldername
Open File and See content
cat filename
Finding File
find -name ‘*.txt’
and
locate "*.c" -n 10 ---- -n 10 limit result to 10
Copy file to directory
cp file dir1/dir2
Copy folder to directory
cp –r folder dir1/dir2
Renaming file
mv filename1 filename2
Moving file to directory
mv file dir1/file2
Find all username who has currently login
who
Find username of me
whomi
Send message to other user
write username/ip
Change permission on file
chmod 777 filename
Point Tables
R W X
4 2 1
Owner Group Other
Owner = rwx = 4+2+1=7
Group = rwx = 4+2+1=7
Other = rwx = 4+2+1=7
Text Editor Commads
vi filename
Save changes to buffer
ESC + :w
Save changes and quit vi
ESC +:wq
Save file to new file
ESC +:w filename
Quit without saving
ESC + :q!
Save lines to new file
ESC + :10,15w file
Restarting Server
reboot
start/stop/restart services
service httpd start
service httpd stop
service httpd restart
Stoping firewall
iptables stop