mkdir, ls ... commands not found?!

Mon Apr 5 19:13:00 GMT 1999

Hello,
I am a new user of cygwin. After I downloaded full.exe from "latest" and
installed cygwin following the steps, everything seems fine. But as I
decompressed cygwin1-20.1.dll.bz2, replaced the cygwin1.dll in the
original installation of 20.0, I found that most commands cannot be
recognized by bash.exe.
The error message after I typed ls or mkdir is: command not found.
I then uninstall and reinstall, but such problem still exists. Could you
please tell me what is the problem? Thank you very much in advance!
Regards,
Yurong
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