Operating System

Linux find and replace in string

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Some useful ways to manipulate files: Array: Array could be crated like You can see that values are separated through space. Store multiline string to variable: Use cat command like below: Be careful with ‘END’ word. There should be any space before it, otherwise it will considered as a line. Looping through array: We can … Read more

MSSQL Add full text search (Linux)

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If you need to add a full text search index on you column, then you need to add an extra package. You can install it by using the following command: If the package is not found, then you need to go to Windows Docs to install the required repository. After that you just to need … Read more

Install any perl module on CentOS

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First make user CPAN is installed. To check run ‘cpan’ command. If it is installed then you be in the cpan CLI. To quit the CLI write ‘q’ and press enter. If not installed please go here To install any module, use following command: In above command ‘SHA’ is the module that is installed.

Install CPAN on CentOS

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CPAN allows to install perl modules. Use following command to install CPAN: Then configure it using following command: Most of the configuration could be done automatically. So choose that option. To quit the cpan CLI write ‘q’ and press enter.

General Overview Of UNIX System

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First UNIX system was developed in 1969 and ran on systems from microprocessors to mainframes and provided a common execution environment across them. The system was divided into two parts : Programs and services: It is the part readily apparent to users e.g. shell, mail text editor etc. Operating System: That supports above-mentioned programs and service. … Read more

Kernel Architecture of Various Popular Operating Systems.

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Overview : UNIX : Layered Architecture Linux : Monolithic Architecture Windows : Hybrid Architecture (Microkernel + Layered) Mach : Microkernel Architecture. UNIX KERNEL ARCHITECTURE : Unix OS considers files and processes as the most important entities.   Unix offers a shell that acts as a command interpreter between the user and the kernel. The relevant … Read more