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When somebody asks me about how strong you are in unix/linux internals ? What do they really mean ?

Though i have some idea, i would like to hear from some experts that, what is really meant by unix/linux internals.

My ideas are, i have to be strong in,

  • linux boot process
  • user creation
  • how does a command executes
  • filesystem related details
  • process details

I would like to know, whether this is sufficient or something else there ?

Update: I edited this question to add more details, if possible reopen the questions for answers?!

+1  A: 

The internal design of the components of the Linux operating system (i.e. the kernel).

ternaryOperator
does this is the only thing they mean ? or some thing else has to be added. Note: i updated the question accordingly.