How to Use the Command 'cs' (with examples)

The ‘cs’ command refers to Coursier, a versatile application and artifact manager primarily utilized for the Scala programming language. It simplifies the process of managing Scala applications and setting up a Scala development environment. With functionalities ranging from the installation of applications to updating and listing them, ‘cs’ provides a plethora of utilities for Scala developers through its various subcommands.

Use Case: List Installed Applications

Code:

cs list

Motivation for using:

Listing installed applications is crucial for developers who wish to inventory their current setup, especially when managing multiple projects that might require different tools or versions. By using ‘cs list’, developers can easily identify which Scala applications are currently available on their system, which facilitates efficient project management and planning for updates or installations.

Explanation of arguments:

• list: This subcommand is used without additional arguments. It tells Coursier to retrieve and display a list of all applications currently installed via ‘cs’. This includes both the version and the name of each installed application, offering a quick overview of the tools readily available.

Example output:

sbt 1.5.5
ammonite-repl 2.4.0
scala 3.0.2

Use Case: Install a Specific Application

Code:

cs install application_name

Motivation for using:

When a developer needs to add a new tool or upgrade an existing one to a specific version, using cs install streamlines the process. This is particularly useful when initiating a new project or when there is a need to leverage the unique functionalities of that application, which may not be available in currently installed tools.

Explanation of arguments:

• install: This subcommand tells Coursier to download and setup an application on your system.
• application_name: Replace this with the actual name of the application you want to install. For example, you might use cs install sbt to install the Scala Build Tool.

Example output:

Fetching sbt 1.5.5
Installed sbt 1.5.5

Use Case: Uninstall a Specific Application

Code:

cs uninstall application_name

Motivation for using:

Over time, certain applications may become redundant or need to be removed to free up resources or resolve compatibility issues. Using cs uninstall allows developers to efficiently manage their environment by removing such applications, ensuring that only necessary tools are retained.

Explanation of arguments:

• uninstall: This subcommand triggers the removal process of a specified application.
• application_name: The exact name of the application to uninstall. For instance, cs uninstall sbt would remove the Scala Build Tool if it’s no longer needed.

Example output:

Uninstalled sbt

Use Case: Setup Machine for the Scala Development

Code:

cs setup

Motivation for using:

Setting up a machine for Scala development is a critical first step for developers new to Scala or when configuring a fresh environment. The cs setup command automates this process, eliminating manual configuration errors and ensuring that all necessary components are appropriately installed and configured for development.

Explanation of arguments:

• setup: This subcommand is invoked to prepare your system for Scala development. It installs key components like a compatible JVM, essential Scala tools such as sbt, and other necessary dependencies.

Example output:

Configuring Scala development environment...
Installed JDK 11
Setup complete.

Use Case: Update All the Installed Applications

Code:

cs update

Motivation for using:

Software tools frequently receive updates to fix bugs, improve performance, or add new features. The cs update command is crucial for developers who want to ensure they are using the latest and most secure versions of their tools without manually checking and updating each one.

Explanation of arguments:

• update: This subcommand instructs Coursier to check for the latest versions of all applications currently installed and update them if newer versions exist.

Example output:

Updating sbt...
Updated sbt from 1.5.5 to 1.5.6
All applications are up to date.

Use Case: Display Version

Code:

cs version

Motivation for using:

Determining the version of Coursier can assist in debugging issues, seeking support, or ensuring compatibility with plugins and tools. The cs version command provides this information instantly, aiding transparency in toolchain management.

Explanation of arguments:

• version: This simple subcommand queries and displays the current version of the Coursier application manager installed on your machine.

Example output:

cs version 2.0.16

Conclusion:

The ‘cs’ command streamlines the management of Scala applications and environments, reducing complexities associated with setup and application maintenance. By utilizing the subcommands discussed, developers can efficiently manage their development tools, ensuring they remain current, applicable, and efficient in a demanding development landscape. Whether setting up a new environment or maintaining an existing one, ‘cs’ offers a robust solution tailored to the needs of Scala developers.