Unix Fundamental Commands: -

Part - 1:-
Q) Why we go for Unix Operating Systems where windows is a popular operating system ?
Ans - These are the below points why we go for Unix Operating System.
1. Multi User, Multi Tasking
2. Crash Free
3. Virus Free
Q) Unix Architecture ?
Ans -

SHELL - It is the interface between user and kernel. It receives the input from user, converts it
into kernel understandable codes and send to kernel.
KERNEL - It interacts with hardware, process the input received from shell and response back
to shell.
HARDWARE - It stores physical data as computer hardware.
Q) How are you change your Unix Password ?
Ans - $ passwd <Enter Key>
Old Password: <Enter your Old Password><Enter Key>
New Password: <Enter your New Password><Enter Key>
         $
Note - These passwords are not visible to your eyes.
Q) How to log off from Unix Operating System ?
Ans - $ exit<Enter Key>
Q) How to see current date and time ?
Ans - $ date<Enter Key>
Q) How to see current month calender ?
Ans - $ cal<Enter Key>
Q) How to see year calender ?
Ans - $ cal <year><Enter Key>
Example - $ cal 2019
Q) How to see July 1967 calender ?
Ans - $ cal <Month Number> <Year><Enter Key>
Example - $ cal 07 1967