Flex Tutorial

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

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.

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

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

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

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

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

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.

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

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