Using sha256sum command for ensuring file integrity
sha256sum command generates and checks the SHA256 checksum for files. How to use sha256sum command for SHA256 is explained with an example.
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May 13, 2022
File I/O in Linux
Buffered I/O and synchronized I/O and the input output system calls, open, creat, read, write, lseek, close and unlink are explained.
May 16, 2020
Files in Linux
Files are used to store information on persistent secondary storage. FIles and processes are basic concepts in Unix-like systems.
May 1, 2020
Analyzing the NGINX web server log file
A Perl script for generating the report of the most frequent visitors to a website from the nginx log file is given.
October 3, 2018
Using Git
Git is a popular, widely used, source code management system, originally developed by Linus Torvalds. Common Git commands are listed.
September 30, 2018
Bash idioms
bash idioms are tiny scripts, mostly one-liners, that accomplish a lot and can be used as building blocks in larger scripts.
September 30, 2018
comm command in Linux
comm compares two sorted files and gives three column output regarding, lines unique to file 1, lines unique to file 2 and the common lines.
September 29, 2018
grep Command in Linux
grep is a program for searching string patterns in files. It searches files for the patterns and prints the matching lines.
September 29, 2018
An Introduction to Shell in Linux
Shell is the command line user interface to a UNIX-like system. bash is the default shell under Linux.
September 29, 2018
umask in Linux
The umask command is used for setting a mask which is used for managing the permissions of files created by processes during a login session.
September 29, 2018