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2076 articles
How to reject mail for unknown users in postfix (local_recipient_maps)
How to reject mail for unknown users on localhost with Postfix with local_recipient_maps with example
How to restrict IP Address to use postfix smtp relay
How can I restrict my postfix smtp relay server to be used by only certain IP Address, How to block or allow postfix relay access using mynetworks example
3 easy steps to configure gmail smtp relay with postfix
Step by step tutorial to configure postfix using third party gmail smtp relay to send mails to external network. Use SASL with Google 2-Step Authentication
10 practical examples of tmux configuration with examples
In this tutorial I will use tmux.conf and show different examples to modify your tmux configuration such as define custom prefix key etc
Complete tutorial on tmux commands with examples from scratch
In this tutorial I will cover the basics of tmux from scratch using various tmux commands to create session, windows, splitting panes, killing session etc
3 simple & easy steps to install vlc player on CentOS 8
Step by step tutorial to install vlc player media on linux with and without head for both GUI and CLI mode with examples
8 simple steps to configure ldap client RHEL/CentOS 8
Steps to install and configure ldap client using SSSD on RHEL and CentOS 8 Linux. The configuration using SSSD over TLS and SSL encryption for ldap client
How to create, read, append, write to file in Python
use open() or with open() function with different modes to create, write, append content to a text or binary file. Python write to file by overwriting the …
grep Exact Match in Linux (Match Whole Word or Exact String)
Learn how to grep exact match in Linux using the grep command. This tutorial explains how to match exact words, exact strings, and entire lines using options …
How to add user to sudoers with best practices & examples
How to add user to sudoers file? How to give root privileges to a user in linux? how to give superuser permission in linux? sudoers syntax with examples
3 simple and useful tools to grep multiple strings in Linux
How to grep multiple strings and patterns in single line from a file in Linux or Unix? Is it possible to grep multiple strings using single command from a file? …
Mastering Python subprocess Module [In-Depth Tutorial]
The different functions available with python subprocess are Popen(), call(), run(), check_call(), check_output(). What is the difference between these …
4 easy methods to check sudo access for user in Linux
How to check sudo access for a normal user? Is it possible to know if a user has sudo access using a script without password prompt?
Use Python Logging Like a PRO: Don't be a Rookie
Learn how to use python logging module with examples. Write to console, stdout, stderr, to log file or syslog. Create single or multiple handlers using …
How to use python if else in one line with examples
Learn how to use python if else statement in one line using ternary operator. You can also hack your way to use nested if else or if elif else in single line