Application programs: Mail-FTP-DBMS, etc...
Shell: Interaction btw user and OS.
Kernel: Hearth of OS. Bridge btween hardware and user interface. I/O, processes
Hardware: CPU-GPU-Harddisk-etc. physicall
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We can access to the shell via terminal. Terminal is not the shell, just a kind of emulator...
to see version of the shell type below command on terminal;
echo $SHELL
to see kernel;
uname
for more information regarding kernel;
uname - a
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