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A UNIX/Linux blog containing most of the Linux/Unix resources & articles and providing new generation of Linux Operating Environment for download and use.

Linux/Unix

How to update RHEL, or centos major release version: from RHEL 5 to RHEL 6, or from RHEL6 to RHEL 7 ?

Today in this post, we will look how to perform redhat or centos major release upgrade.   I. RHEL 5...
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Linux/Unix Shell Scripting

What is IFS in linux bash shell ?

1. Introduction IFS stands for Internal Field Separator in Linux. $IFS is one of the system variable with default value...
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Linux/Unix Shell Scripting

How to color a text/string in linux bash shell & make it blink ?

An interesting thing to do when creating shell scripts is to know how to color some text/output and blink it....
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Linux/Unix Shell Scripting

What are different types of positional parameters available in linux ?

Positional parameters as its name suggests are different positional variables automatically defined by linux shell. The shell automatically assigns the...
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Linux/Unix

How to mount a filesystem from backup superblock location ?

Let us look how to mount a filesystem from backup superblock location. In general this is not required, however sometimes...
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Linux/Unix Shell Scripting

How to search and replace text where line contains some specific string in Linux shell ?

Today we will look how to search some text in a file and replace specific string on the searched line....
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Linux/Unix Shell Scripting

Regex to look for multiple characters or words in linux bash shell ?

Today we will look at the regex to search/grep multiple characters or words from a file or output in linux....
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Linux/Unix Shell Scripting

Use of dot “.” in regular expressions during search/grep in bash shell linux ?

Today we will look at the usage of dot "." on Linux bash shell and how to use it in...
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Linux/Unix Shell Scripting

How to get length of a string/integer variable in linux bash shell ?

Today in this post, we will look how to get length of a variable in linux whether its a string...
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Linux/Unix Shell Scripting

How to unset variables in linux bash shell (normal and read only variables) ?

We all know that a variable is defined by simply assigning a value to it. However bash shell also provides...
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