Beginner 9. 0

Source: Internet
Author: User
Beginner 9. 0 -- Linux general technology-Linux technology and application information. The following is a detailed description. I originally wanted to learn linux Through redhat9.0 (my machine is too old to go to the Hongqi GUI). Maybe I am already a P5 user, and there is always an error:
1. Enter su in the terminal, press enter, and enter the password. bash: command not found appears.
Then there will be no more
2. the USB flash disk cannot be mounted no matter whether you enter any command.
3. It seems that this system cannot download or listen to MP3 files on the Internet.
Hope you can help me!
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