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Write once, run many

The Java™ Tutorials by Oracle

The Java Tutorials are practical guides for programmers who want to use the Java programming language to create applications. They include hundreds of complete, working examples, and dozens of lessons. Groups of related lessons are organized into "trails".

https://docs.oracle.com/javase/tutorial/

Learn to Program in Java at edX.ogr

Get started on the path to becoming a software engineer by learning core coding skills in Java—one of the most popular programming languages.

https://www.edx.org/course/learn-to-program-in-java-0

Java Tutorial by javapoint.com

https://www.javatpoint.com/java-tutorial

Java Tutorial by SoloLearn.com

I love SoloLearn because I can learn Java - and other popular programming languages - anywhere, any time on your mobile devices.

https://www.sololearn.com/Course/Java/

Java on Azure

https://docs.microsoft.com/en-us/learn/paths/java-on-azure/

Java on Azure - Source: https://docs.microsoft.com/en-us/learn/modules/intro-to-java-azure/media/5-java-on-azure-info-graphic.jpg

Java resources

>>> Oracle's Java Documentation

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lastlog command reports the most recent login of all users or of a given user. NAME lastlog - reports the most recent login of all users or of a given user SYNOPSIS lastlog [options] DESCRIPTION lastlog formats and prints the contents of the last login log /var/log/lastlog file. The login-name, port, and last login time will be printed. The default (no flags) causes lastlog entries to be printed, sorted by their order in /etc/passwd. OPTIONS The options which apply to the lastlog command are: -b, --before DAYS Print only lastlog records older than DAYS. -h, --help Display help message and exit. -R, --root CHROOT_DIR Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory. -t, --time DAYS Print the lastlog records more recent than DAYS. -u, --user LOGIN|RANGE Print the ...