New answers tagged macintosh
webster is not a common command among Unix systems. It is not a part of Debian's apt repository and it is also not part of the two major packaging tools Homebrew and MacPorts. Probably it is only available on Stanford computers. However additional commands can be installed with ease using one of the two. I would suggest using Homebrew since many packages ...
Perhaps the closest thing to what you are looking for is MacPorts (or some other package management system like Homebrew). It can be used to install software(including many Unix software) easily.
This might do what you want: sudo update-alternatives --config java
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