Flex Tutorial

flex, "fast lexical analyzer", is a software tool for scanning input file and breaking it into recognizable chunks of text, called tokens.

September 9, 2023

Process synchronization

The problem of synchronizing multiple concurrent processes is explained and a solution is provided with an example program.

February 10, 2023

Regular expressions are used for searching strings in text files. Regular expressions are explained with usage in a C program.

January 26, 2023

Resolution of the problem of vi editor not showing color syntax highlighting in the edit window in Ubuntu Linux.

Comments Off

October 27, 2022

sha256sum command generates and checks the SHA256 checksum for files. How to use sha256sum command for SHA256 is explained with an example.

May 13, 2022

Solution to the problem of not being able to access the guest OS from the host in VirtualBox is given with steps.

February 19, 2022

Solution to the problen of not able to mount VirtualBox Guest Additions CD image and installation of Guest Additions.

February 9, 2022

Resoution of the problem of "vboxdrv kernel module is not loaded" during the first time running of VirtualBox after installation.

February 6, 2022

Resolution of the error observed while running VirtualBox the first time, "No Bootable medium found. System halted".

February 5, 2022

The dining philosophers problem is about deadlock in concurrent systems. The dining philosophers problem is explained with example programs.

August 30, 2021