What if the redhat system mistakenly deleted the /usr/bin directory, thus making it impossible to log in to the system? Urgently need to solve ah ~ ask everybody to help answer ah ~ thank you! !
Oh, my god.
There is no alternative but to install the same version of redhat on a blank machine, install roughly the same software, and then copy the entire /usr/bin.
Fortunately, it was /usr/bin that was lost. If you lose /etc or /var, it is really too late to cry …