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What are the differences between opt and usr in linux partition?

Source: Internet
Author: User
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What are the differences between opt and usr in linux partition?-General Linux technology-Linux technology and application information. For more information, see the following. 1. Why partition/boot,/var,/usr, and so on when linux is installed for partitioning, if you do not separate/AND/home, will the/var and/usr folders not exist in the/partition after installation?
2. Is there a functional difference between a primary partition and a logical partition? Which partition should be used by/boot,/,/home,/swap, etc?
3. I also want to ask the terminal to use the cd command to return ~ What is the difference ,~ What is the directory?
4. How long does it take to learn how to use linux normally?
Thank you!

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