Java - Authenticate users in Active directory and using LDAP

First lets me try to explain you in brief what is Active directory and LDAP

Active Directory is a database based system that provides authentication, directory, policy, and other services in a Windows environment

LDAP (Lightweight Directory Access Protocol) is an application protocol for querying and modifying items in directory service providers like Active Directory, which supports a form of LDAP.

In short, Active Directory is a directory services database and LDAP is one of the protocols you can use to talk to it.

1. Authenticate users in Active Directory

Directly you can run this code, no need to add any jar file.

Java - To Load a property file

Property files are used to store static information in a key-value pair. Things that you do not want to hard code in your Java code, which tend to change in future goes into properties files. Also as it is a static information you do not want to load the property file for each and every request as it may hamper performance. You may need it to be loaded only once at the begining of the loading of application.

You can load properties file using below methods. You can provide absolute path as well as relative path however mostly relative path is preferred.

prop.load(AppProperties.class.getClassLoader().getResourceAsStream("app.properties"));
OR
prop.load(new FileInputStream(new File("C:/temp/app.properties")));

Please see the self explanatory java code below - 

LINUX - Shell script to detect file change

Below is the simple shell script which can be used to detect the file change in a particular directory. It can detect file modified, file touched, new file created, file deleted / moved, files mode change (chmod) / files owner change (chown). It runs continuously after a sleep of specified interval and compare the list of files against the list of files prior to sleep.

Please see the self explanatory shell script below.