A self-signed SSL certificates are often used for testing purposes. It is a certificate that is not signed by a trusted certificate authority (CA). This tutorial shows how to check...

Private key consist of various components such as modulus, public exponent, private exponent, coefficient, etc. This tutorial demonstrates how to decode private key using OpenSSL. Let's say we have the...

SSL certificate contains information about subject to whom the certificate has been issued. It includes organization name, organizational unit name, common name, etc. SSL certificate also contains serial number, expiration...

A self-signed SSL certificate is a certificate that is not signed by a trusted certificate authority (CA). A self-signed certificate commonly used for testing purposes or internal usage. This tutorial...

In Linux system, a group is a collection of users which have the same permissions on files and directories. When working as system administrator, might need to add or remove...

In Linux system, a group is a collection of users which have the same permissions on files and directories. When working as system administrator, might need to delete a group...

In Linux system, a group is a collection of users which have the same permissions on files and directories. When working as system administrator, might need to create a group...

Renaming a directory is one of the most basic operation which can be performed in the operating system. This tutorial provides 2 methods how to do that on Windows. Method...

Log files are dynamic and their content changes frequently in time. To monitor log files, their content should be watched when it changes. This tutorial demonstrates how to watch a...

When processing files via command line on Windows, may need to insert a text at the beginning of a file. This tutorial demonstrates how to do that on Windows. Create...