How to identify /dev/mapper/path actual device on our linux system ?
Today in this post, we will look how to identify the lvm, or multipath device which is mapped by device mapper on our system. Device mapper automatically creates a pseudo...
Tag: centos
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What is the meaning of 0 in /proc/sys/kernel/ctrl-alt-del file in Linux ?
Do you know what is the meaning of value stored in /proc/sys/kernel/ctrl-alt-del file ? Let us have a look at it. I. Meaning of default values [root@ngelinux kernel]# cd /proc/sys/kernel...
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Explanation of /etc/prelink.cache & prelink.conf file : What is prelink cache in Linux ?
I. Introduction prelink as its name suggests is a program used to link ELF shared libraries and binaries in order to speed up startup time. Synopsis prelink [OPTION...] [FILES] prelink...
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How to take dump or backup of all mysql databases in Linux ?
Today we will look how to take backup/dump of all mysql databases of our linux system from command line. I. Taking Backup To take backup, we will use mysqldump command...
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Solved: lastb command not working or utmp file not updating.
Today we will look at the solution of two issues w.r.t lastb command. lastb command by default shows details of all the bad login attempts. Issue 1: last command display...
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How to view current logged in users in linux ?
Today we will look various different ways to view current logged in users in linux. The user login data is usually saved and read from /var/run/utmp file. Lets see different...
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How to view, setup and analyze sshd(Secure shell daemon) logs in redhat or centos linux ?
In this article, we will look how to view, analyze and setup SSHD logs on our Redhat or Centos Linux system. 1. Viewing SSHD Log file. ## For Ubuntu [root@nglinux...
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What is character class in bash shell linux and how to use them to search a pattern ?
In Linux, Character Classes is a group of characters which are responsible to perform pattern matching. Character Classes are defined using “[]” i.e. square brackets and matches any of the...