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…
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…
Uname command with examples
1. uname command The uname command prints information about the system. uname is a portmanteau word made up from "unix" and "name". uname can be called from the command line…
Syslog
1.0 Syslog Syslog is a protocol for conveying event notification messages. Syslog was first developed by Eric Allman for logging as a part of the Sendmail project in the 1980s.…
POSIX Shared Memory in Linux
1.0 Shared Memory Shared memory is an inter process communication (IPC) mechanism in Linux and other UNIX-like systems. Based on input parameters, the kernel provides a (shared) memory segment to…
POSIX Semaphores in Linux
1.0 Semaphores Semaphores are used for process and thread synchronization. Semaphores are clubbed with message queues and shared memory under the Interprocess Communication (IPC) facilities in Unix-like systems such as…
Tiger
awk Tutorial
1.0 awk awk is a filter which takes the input and gives output after matching desired patterns and doing processing linked to matched patterns. awk is well suited for processing…
sed command in Linux
1.0 sed sed is a stream editor that accepts a list of commands and input file names. It applies the commands one by one on each line of input and…
grep Command in Linux
1.0 grep grep is a program for searching a given string pattern in files. It searches the files for the pattern and prints the lines that contain strings matching the…
Trigonometric calculations with bc
bc, the basic calculator under Linux and UNIX environments, provides commands for doing arbitrary precision mathematical calculations. The syntax for basic arithmetic functions is intuitive. Here, we look at the…