SDKMAN – A CLI Tool To Easily Manage Multiple Software Development Kits
Are you a developer who often install and test applications on different SDKs? I’ve got a good news for you! Say hello to SDKMAN, a CLI tool that helps you to easily manage multiple software development kits. It provides a convenient way to install, switch, list and remove candidates. Using SDKMAN, you can now manage parallel versions of multiple SDKs easily on any Unix-like operating system. It allows the developers to install Software Development Kits for the JVM such as Java, Groovy, Scala, Kotlin and Ceylon. Ant, Gradle, Grails, Maven, SBT, Spark, Spring Boot, Vert.x and many others are also supported. SDKMAN is free, light weight, open source and written in Bash.
Installing SDKMAN is trivial. First, make sure you have installed zip and unzip applications. It is available in the default repositories of most Linux distributions. For instance, to install unzip on Debian-based systems, simply run:
$ sudo apt-get install zip unzip
Then, install SDKMAN using command:
$ curl -s "https://get.sdkman.io" | bash
It’s that simple. Once the installation is completed, run the following command:
$ source "$HOME/.sdkman/bin/sdkman-init.sh"
If you want to install it in a custom location of your choice other than $HOME/.sdkman, for example /usr/local/, do:
$ export SDKMAN_DIR="/usr/local/sdkman" && curl -s "https://get.sdkman.io" | bash
Make sure your user has full access rights to this folder.
Finally, check if the installation is succeeded using command:
$ sdk version ==== BROADCAST ================================================================= * 01/08/18: Kotlin 1.2.60 released on SDKMAN! #kotlin * 31/07/18: Sbt 1.2.0 released on SDKMAN! #sbt * 31/07/18: Infrastructor 0.2.1 released on SDKMAN! #infrastructor ================================================================================ SDKMAN 5.7.2+323
Congratulations! SDKMAN has been installed. Let us go ahead and see how to install and manage SDKs.
Manage Multiple Software Development Kits
To view the list of available candidates(SDKs), run:
$ sdk list
Sample output would be:
================================================================================ Available Candidates ================================================================================ q-quit /-search down j-down ?-search up k-up h-help -------------------------------------------------------------------------------- Ant (1.10.1) https://ant.apache.org/ Apache Ant is a Java library and command-line tool whose mission is to drive processes described in build files as targets and extension points dependent upon each other. The main known usage of Ant is the build of Java applications. Ant supplies a number of built-in tasks allowing to compile, assemble, test and run Java applications. Ant can also be used effectively to build non Java applications, for instance C or C++ applications. More generally, Ant can be used to pilot any type of process which can be described in terms of targets and tasks. : $ sdk install ant
As you can see, SDKMAN list one candidate at a time along with the description of the candidate and it’s official website and the installation command. Press ENTER key to list the next candidates.
To install a SDK, for example Java JDK, run:
$ sdk install java
Downloading: java 8.0.172-zulu In progress... ######################################################################################## 100.0% Repackaging Java 8.0.172-zulu... Done repackaging... Installing: java 8.0.172-zulu Done installing! Setting java 8.0.172-zulu as default.
If you have multiple SDKs, it will prompt if you want the currently installed version to be set as default. Answering Yes will set the currently installed version as default.
To install particular version of a SDK, do:
$ sdk install ant 1.10.1
If you already have local installation of a specific candidate, you can set it as local version like below.
$ sdk install groovy 3.0.0-SNAPSHOT /path/to/groovy-3.0.0-SNAPSHOT
To list a particular candidates versions:
$ sdk list ant
================================================================================ Available Ant Versions ================================================================================ > * 1.10.1 1.10.0 1.9.9 1.9.8 1.9.7 ================================================================================ + - local version * - installed > - currently in use ================================================================================
Like I already said, If you have installed multiple versions, SDKMAN will prompt whether you want the currently installed version to be set as default. You can answer Yes to set it as default. Also, you can do that later by using the following command:
$ sdk default ant 1.9.9
The above command will set Apache Ant version 1.9.9 as default.
You can choose which version of an installed candidate to use by using the following command:
$ sdk use ant 1.9.9
To check what is currently in use for a Candidate, for example Java, run:
$ sdk current java Using java version 8.0.172-zulu
To check what is currently in use for all Candidates, for example Java, run:
$ sdk current Using: ant: 1.10.1 java: 8.0.172-zulu
To upgrade an outdated candidate, do:
$ sdk upgrade scala
You can also check what is outdated for all Candidates as well.
$ sdk upgrade
SDKMAN has offline mode feature that allows the SDKMAN to function when working offline. You can enable or disable the offline mode at any time by using the following commands:
$ sdk offline enable
$ sdk offline disable
To remove an installed SDK, run:
$ sdk uninstall ant 1.9.9
For more details, check the help section.
$ sdk help Usage: sdk <command> [candidate] [version] sdk offline <enable|disable> commands: install or i <candidate> [version] uninstall or rm <candidate> <version> list or ls [candidate] use or u <candidate> [version] default or d <candidate> [version] current or c [candidate] upgrade or ug [candidate] version or v broadcast or b help or h offline [enable|disable] selfupdate [force] update flush <broadcast|archives|temp> candidate : the SDK to install: groovy, scala, grails, gradle, kotlin, etc. use list command for comprehensive list of candidates eg: $ sdk list version : where optional, defaults to latest stable if not provided eg: $ sdk install groovy
The following command installs a new version of SDKMAN if it is available.
$ sdk selfupdate
SDKMAN will also periodically check for any updates and let you know with instruction on how to update.
WARNING: SDKMAN is out-of-date and requires an update. $ sdk update Adding new candidates(s): scala
It is recommended to clean the cache that contains the downloaded SDK binaries from time to time. To do so, simply run:
$ sdk flush archives
It is also good to clean temporary folder to save up some space:
$ sdk flush temp
If you don’t need SDKMAN or don’t like it, remove as shown below.
$ tar zcvf ~/sdkman-backup_$(date +%F-%kh%M).tar.gz -C ~/ .sdkman $ rm -rf ~/.sdkman
Finally, open your .bashrc, .bash_profile and/or .profile files and find and remove the following lines.
#THIS MUST BE AT THE END OF THE FILE FOR SDKMAN TO WORK!!! export SDKMAN_DIR="/home/sk/.sdkman" [[ -s "/home/sk/.sdkman/bin/sdkman-init.sh" ]] && source "/home/sk/.sdkman/bin/sdkman-init.sh"
If you use ZSH, remove the above line from the .zshrc file.