Program to find the day of the week for a given date
1.0 Day of Week The Gregorian calendar was adopted in 1582. The formula to find the day of the week for any date after 1582 is, d = N +…
Flex Tutorial
1.0 Flex and Bison Flex and Bison are software tools used for processing structured input. Flex stands for "fast lexical analyzer" and is used for scanning the input and breaking…
Process synchronization
1.0 Problem Suppose there are n concurrent peer processes, where n > 1. All these processes have a checkpoint, which is an important point in the execution trace of the…
Regular Expressions in C
1.0 Introduction Regular expressions are used for searching strings in text files. A regular expression is a string of characters and may contain certain metacharacters. A metacharacter has a special…
vi not showing color syntax highlighting in Ubuntu Linux
1.0 Error The vi editor in Ubuntu Linux distribution is not showing color syntax highlighting in the edit window. 2.0 Solution vi is one of the original text editors of…
Using sha256sum command for ensuring file integrity
1.0 SHA-2 A cryptographic hash function (CHF) is an algorithm to map arbitrary size data, called the message, to a fixed sized bit array, called the hash value, or message…
VirtualBox – Not able to access guest from the host OS
Solution to the problem of not being able to access the guest OS from the host in VirtualBox is given with steps.
VirtualBox – unable to mount Guest Additions ISO file in virtual machine
Solution to the problen of not able to mount VirtualBox Guest Additions CD image and installation of Guest Additions.
VirtualBox – vboxdrv kernel module is not loaded
Resoution of the problem of "vboxdrv kernel module is not loaded" during the first time running of VirtualBox after installation.
VirtualBox – No Bootable medium found. System halted.
Resolution of the error observed while running VirtualBox the first time, "No Bootable medium found. System halted".