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

vi not showing color syntax highlighting in Ubuntu Linux

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

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October 27, 2022

The uname command is used to print information about the host system. uname is derived from "unix" and "name".

November 2, 2019

Syslog is a protocol for conveying event notification messages. Syslog concepts and calls for logging messages are explained.

October 3, 2018

How to do interprocess communication using the POSIX shared memory calls is explained with example client-server programs.

October 3, 2018

POSIX semaphores provide a mechanism for interprocess synchronization. POSIX named and unnamed semaphores are explained with example programs.

October 3, 2018

Awk is a domain specific programming language, suitable for text processing, data extraction and report generation applications.

September 29, 2018

sed is a stream editor that applies the commands one by one on each line of input and writes the resulting lines on the standard output.

September 29, 2018

grep is a program for searching string patterns in files. It searches files for the patterns and prints the matching lines.

September 29, 2018

How to do trigonometric calculations using bc, the command line basic calculator available with Linux and Unix systems.

September 28, 2018