ramraje.com » Linux http://www.ramraje.com Software Programming Blog Fri, 28 May 2010 17:03:12 +0000 http://wordpress.org/?v=2.9.2 en hourly 1 How to find installed RPM software packages http://www.ramraje.com/linux/how-to-find-installed-rpm-software-packages/ http://www.ramraje.com/linux/how-to-find-installed-rpm-software-packages/#comments Tue, 21 Jul 2009 06:15:24 +0000 Ramraj Edagutti http://www.ramraje.com/?p=171 I was trying to install mysql in centOS, which is rpm based Linux operating system like redhat, fedora etc. And I wanted to find out if it already installed or not.

Here is the command which list all the installed rpm software packages..

rpm -qa
  1. Above command list all packages, q means query and a means all.
  2.  
  3. rpm command generally used for installing rpm archive packages manually, and one can also see all installed packages as mentioned.
  4.  
  5. If you want to see few installed packages at a time then use below command
  6. <pre lang="bash">rpm -qa | less

This command lists the installed rpm packages in less linux shell text editor, it will show few at a time, to see more just keep pressing enter button on your keyboard.

To see specific rpm software package like mysql or python, run below command

rpm -qa | grep mysql -- To see mysql packages
  1. rpm -qa | grep python -- To see python packages

To list the rpm packages in sorted manner, run below command

rpm -qa | sort | less
  1. To get sorted rpm packages list in text file, run below command
  2. <pre lang="bash">rpm -qa | sort &gt; packages.txt

I hope these commands may help in finding installed rpm packages. For any help email me or give a comment below in the comment box.

]]> http://www.ramraje.com/linux/how-to-find-installed-rpm-software-packages/feed/ 0 How to see CentOS linux version http://www.ramraje.com/linux/how-to-see-centos-linux-version/ http://www.ramraje.com/linux/how-to-see-centos-linux-version/#comments Mon, 20 Jul 2009 11:55:43 +0000 Ramraj Edagutti http://www.ramraje.com/?p=163 Many times I forget the Linux command which is used to see the centOS linux operating system version. So, decided to write down it here on my blog and refer back when i forget. I hope it may also help others!

Below is the command used for finding centOS linux version

cat /etc/redhat-release/ — CentOs uses redhat kernal
  1. Output is as below
  2. <pre lang="bash">CentOS release 4.6 (Final)

Same command in generic way for any linux machine

cat /etc/*release*/
  1. Another alternative command to see the Linux operating system version
  2. <pre lang="bash">cat /etc/issue

One more alternative command to see rpm based Linux versions, and also this command list all the rpm packages installed and their version numbers.

rpm -qa | grep centos

From now, If I forget this command, I can refer back here. Bravo!

]]> http://www.ramraje.com/linux/how-to-see-centos-linux-version/feed/ 0 How to start NFS service http://www.ramraje.com/linux/how-to-start-nfs-service/ http://www.ramraje.com/linux/how-to-start-nfs-service/#comments Tue, 30 Jun 2009 16:54:43 +0000 Ramraj Edagutti http://www.ramraje.com/?p=147 What is NFS and NFS service

NFS is the network file system, which is used to mount or link the file system or simply folders from one linux machine to another linux machine.
This mounting makes folders and files transparently available  to the other linux machines across the network.

NFS service

NFS service is the linux service application which runs nfs server on the background, so that nfs clients can access.

How to start the NFS file system

service nfs start

or

service nfs restart

or

/etc/init.d/nfs start

or

/etc/init.d/nfs restart

But before starting nfs service you should make sure that portmap service is running, this is because nfs service depends on portmap service

How to start portmap service

service portmap start

or

service portmap restart

or

/etc/init.d/portmap start

or

/etc/init.d/portmap restart

]]> http://www.ramraje.com/linux/how-to-start-nfs-service/feed/ 0 NFS file system in Linux http://www.ramraje.com/linux/nfs-file-system-in-linux/ http://www.ramraje.com/linux/nfs-file-system-in-linux/#comments Tue, 30 Jun 2009 16:15:42 +0000 Ramraj Edagutti http://www.ramraje.com/?p=143 NFS stands for Network File System. And this is the one which is most widely used file system on Linux operating system based computers. Using this file system you can actually mount a file(s) from one Linux computer to another Linux computer if the both system are in the same network(LAN).

Mounting means just copying the files from source Linux machine to the target Linux machine, to be exact it is  not exactly copy, but it is a link  to the file(s) from the source computer through LAN network and you would see all the files as those were local files.

To have this NFS file system in your computer, you should have NFS service daemon and portmap service daemon installed, and most probably these service comes with your linux operating system.

To check if the NFS and portmap service daemons installed or not, run below commands

service portmap status

If portmap is already installed, it will shows the status otherwise shows unrecognized service.

service nfs status

If NFS is already installed, it will shows the status otherwise shows unrecognized service.

Finally, to mount file/files from one computer to another computer, run below command

mount -t nfs <target_host_ip>:/file/path /file/path

<target_host_ip>:/file/path – target is the your target linux computer and /file/path is file path that you want to mount or copy to the another machine. The path should be from root.

Second argument “/file/path” is the folder path in your target linux  box, and this should be exist, mean you should create it before doing mount.

I hope you this help in mounting files between linux machines.

Leave a comment, If you find it useful or you have any doubts or you can mail me also, find my email at contact me page.



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