in this post you can see some useful linux commands and examples. Veiw centos (Linux) important data, Ping, Download and switch users commands.
1. ifconfig command examples
View all the interfaces along with status.
$ ifconfig -a
Start or stop a specific interface using up and down command as shown below.
$ ifconfig eth0 up
$ ifconfig eth0 down
2. Centos Important information with uname command
Uname command displays important information about the system such as — Kernel name, Host name, Kernel release number
$ uname -a
3. Switch user in centos with su command
Switch to a different user account using su command. Super user can switch to any other user without entering their password.
$ su - USERNAME
4. Install softwares in centos with yum command
To install apache using yum.
$ yum install httpd
To upgrade apache using yum.
$ yum update httpd
To uninstall/remove apache using yum.
$ yum remove httpd
5. Centos ping command
Ping a remote host by sending only 5 packets.
$ ping -c 5 gmail.com
6. Download file in centos with wget command
The quick and effective method to download software, music, video from internet is using wget command.
$ wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.2.1.tar.gz
7. Install packages in centos with rpm command
To install apache using rpm.
# rpm -ivh httpd-2.2.3-22.0.1.el5.i386.rpm
To upgrade apache using rpm.
# rpm -uvh httpd-2.2.3-22.0.1.el5.i386.rpm
To uninstall/remove apache using rpm.
# rpm -ev httpd