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Examples of command line interface are.
a) DOS                                                  

b) UNIX
c) both a & b                                       

d) none of these

c

DOS stands for………
a) disk operating system  
b) drive operating system
c) doc operating system
d) div operating system

a

……is non-graphical command line operating system.
a) UNIX                                

b) LINUX
c) DOS                                  

d) windows

c

DOS operating system is ……used today.
a) commonly                                       

b) not commonly
c) similarly                                           

d) none of these

b

The command shell is used through……to support existing DOS.
a) Microsoft Windows       

b) operating system
c) both a & b                                       

d) none of these

c

UNIX was developed in……….
a) 1950s                                               

b) 1960s
c) 1970s                                

d) 1980s

b