About what a user should be done to use Gnu/Linux before first distributions

[dehqan65]

In The Name Of God The compassionate merciful

Hello;
No that was not point  ;
If we want write 2 lines about what a user should has done to boot and run
Gnu/Linux before first distributions of gnu/linux at 1991 (first days) ,
what can we write in about 2 lines (it's required for a book that humble
will write)?
 for example user should knew about libs and proper gnu executables to boot
and run OS himself .
 What other did he require to know ?

Regards dehqan
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