Kernel & Shell

a)Linux is operating system (OS).

b)Linux system is described as kernel &shell.

c)Kernel is a main program of Linux System. It controls hard wares, CPU,memory, hard disk, network card etc.

d)Shell is an interface between user and
kernel. Shell interprets your input as commands and pass them to kernel.
Case Sensitivity
a)Linux like UNIX is case sensitive.
b)MYFILE.doc, Myfile.doc, mYfiLe.Doc are different.

Online Manual
a)Linux has well-written online manuals.

Related post