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Update update-alternatives.md

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# update-alternatives
> A convenient tool for maintaining symbolic links that determining default commands.
> A convenient tool for maintaining symbolic links to determin default commands.
- Add a symbolic link:
`sudo update-alternatives --install /usr/bin/java java /opt/java/jdk1.8.0_102/bin/java 300`
`sudo update-alternatives --install {{link}} {{name}} {{path}} {{priority}}`
- Configure a symbolic link:
`sudo update-alternatives --config java`
`sudo update-alternatives --config {{name}}`
- Remove a symbolic link:
`sudo update-alternatives --remove java /usr/bin/java`
`sudo update-alternatives --remove {{name}} {{path}}`
- Display information about the specified link group:
- Display information about a specified command:
`update-alternatives --display java`
`update-alternatives --display {{name}}`