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Red Hat training and certifications
Red Hat training and certifications There are many Linux distributions in the marker, but there are only few companies provide enterprise level release support. Red Hat Certification is one of…
RPM commands and examples
RPM(Redhat Package Management) rpm is a very good package management tool. It is mainly used by RedHat, Suse, Fedora and centos. You can use rpm tool to create, install, query…
Linux shortcuts commands
<strong>Linux shortcuts commands</strong> <Ctrl><Alt><F1> Switch to the first text terminal. Under Linux you can have several (6 in standard setup) terminals opened at the same time. <Ctrl><Alt><Fn> (n=1..6) Switch to…
sed examples
sed is one of the very early Unix commands built for command line processing of data files. [root@dev mark]# cat file1 abc adbcd abcd ab efgh ab [root@dev mark]# sed…
Linux ACL getfacl and setfacl examples
Create and manage Access Control Lists (ACLs) ACL is really useful when you are trying to give permission for specific userIDs. First you need to remount the file system with…
Linux/unix cron job guide and examples
o Schedule tasks using cron We need to make sure that crond daemon is configured on bootup time. # chkconfig –list crond crond 0:off 1:off 2:on 3:on 4:on 5:on 6:off…
Creating hard links and soft links on unix/linux servers.
Create hard and soft links Softlink ln -s {target-filename} {symbolic-filename} [ghuru@localhost final]$ ln -s /home/ghuru/lab1 /home/ghuru/final/lab [ghuru@localhost final]$ ls -lia /home/ghuru/final/ 786999 lrwxrwxrwx 1 ghuru ghuru 16 Mar 9 19:04…
Custom yum repository configuration
We can setup our own repository to dowloand install all the programs. It can be done on CentOS, Fedora and RedHat. To install using URL. [root@localhost yum.repos.d]# pwd /etc/yum.repos.d [root@localhost…
How to extend Linux filesystem
Simple way to extend linux file system $umount/mnt/lvm/localvg-usrlv $lvextend –size +2G -n /dev/localvg/usrlv $e2fsck -f /dev/localvg/usrlv $resize2fs /dev/localvg/usrlv $e2fsck -f /dev/localvg/usrlv
RHCSA exam training and tutorial
Understand and Use Essential Tools Access a shell prompt and issue commands with correct syntax You should know how to access to the server through console or using SSH or…