How To Install libjline2-java on Ubuntu
Posted on April 1, 2023 (Last modified on May 20, 2023 )
3 minutes • 541 words
Introduction
In this tutorial we learn how to install libjline2-java on Ubuntu.
What is libjline2-java
libjline2-java is:
JLine is a Java library for handling console input. It is similar in functionality to BSD editline and GNU readline. People familiar with the readline/editline capabilities for modern shells (such as bash and tcsh) will find most of the command editing features of JLine to be familiar.
Jline2 suppors the current features:
- Command history - Lines that have been previously entered may be recalled and edited and can be persisted so that they are available across sessions of your program.
- Line editing - JLine allows full editing of the current command line and attempts to mimic as much of the behavior of GNU Readline as possible, including support for both emacs and vi key mappings.
- Completion - JLine provides a pluggable mechanism for implementing command line tab completion (of course completion can be bound to any key you wish).
- Custom Key bindings - Keys may be arbitrarily remapped to perform a specific action, and JLine attempts to honor any mapping that is set in your existing readline .inputrc file.
- Character Masking - Input may be gathered from the user without any visual feedback. This is useful for prompting for passwords.
- 99.99% Java - The vast portion of JLine is all Java, using only some small bit of native code, provided by the Jansi project, to support Windows.
There are three methods to install libjline2-java on Ubuntu. We can use apt-get, apt and aptitude. In the following sections we will describe each method. You can choose one of them.
Install libjline2-java Using apt-get
Update apt database with apt-get using the following command.
sudo apt-get update
After updating apt database, We can install libjline2-java using apt-get by running the following command:
sudo apt-get -y install libjline2-java
Install libjline2-java Using apt
Update apt database with apt using the following command.
sudo apt update
After updating apt database, We can install libjline2-java using apt by running the following command:
sudo apt -y install libjline2-java
Install libjline2-java Using aptitude
If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Ubuntu. Update apt database with aptitude using the following command.
sudo aptitude update
After updating apt database, We can install libjline2-java using aptitude by running the following command:
sudo aptitude -y install libjline2-java
How To Uninstall libjline2-java on Ubuntu
To uninstall only the libjline2-java package we can use the following command:
sudo apt-get remove libjline2-java
Uninstall libjline2-java And Its Dependencies
To uninstall libjline2-java and its dependencies that are no longer needed by Ubuntu, we can use the command below:
sudo apt-get -y autoremove libjline2-java
Remove libjline2-java Configurations and Data
To remove libjline2-java configuration and data from Ubuntu we can use the following command:
sudo apt-get -y purge libjline2-java
Remove libjline2-java configuration, data, and all of its dependencies
We can use the following command to remove libjline2-java configurations, data and all of its dependencies, we can use the following command:
sudo apt-get -y autoremove --purge libjline2-java
Dependencies
libjline2-java have the following dependencies:
References
Summary
In this tutorial we learn how to install libjline2-java package on Ubuntu using different package management tools: apt, apt-get and aptitude.