![]() If I run update-alternatives with the -display option, I can see that there is a symbolic link at /bin/nc, and it points currently to /bin/nc. In a clean Kali install, nc is simply nc (actually nc.traditional, as I’ll show in a moment). This is managed by the alternatives system. If you’ve ever installed ncat, you may have noticed that running nc actually now runs ncat. ![]() There’s a more powerful version, ncat, that brings in additional functionality, like SSL support, IPv6 support, and proxy support. You can, and really should, use both update-java-alternatives and update-alternatives together. update-alternatives is a symbolic link management system for linux (I'm sure there is little news here). setting JAVAHOME and PATH with update-alternatives Ask Question Asked 2 years, 10 months ago Modified 2 years, 6 months ago Viewed 6k times 3 EDITED The question was more about bash script them java environment and thanks for those whom had the patience and spare the time to reply me. ![]() You can select which one to install from the listed options. Nc is the Swiss Army knife of hacking at things. update-java-alternatives is a program to update alternatives for jre/jdk installations. The command displays all the available Java versions. I’ll use update-altneratives to install the new Java version, and then to change what version java, javac, jar, etc utilize. ![]() For example, I’m currently working on a challenge that requires using an older version of Java to interact with a file. openjdk-10.0.1linux-圆 update alternatives update-alternatives -install /usr/bin/java java /usr/lib/java10/jdk-10.0.1/bin/java 20000. Invoke update-alternatives util and select the required Java installation. But there are times when it is really useful to know how to interact with this yourself. To upgrade Java, the following Open Java Runtime Environment (JRE) or Java. When you run apt install x, it may do some of this behind the scenes for you. Most of the time, this is managed by the package management system. update-alternatives is a symbolic link management system for linux (Im sure there is little news here). Debian Linux (and its derivatives like Ubuntu and Kali) has a system called alternatives that’s designed to manage having different version of some software, or aliasing different commands to different versions within the system.
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