Why Different Commands ?

[Joe(theWordy)Philbrook]

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It would appear that on Jun 15, Vilas Sukhadeve did say:

> Here I would like to know why different commands have to be used in
> Terminal.

That depends...

Some commands are intended to work in a text based interface even when
there isn't an available gui to display a fancy interface. Which means
that they will generally require some form of terminal to interface with
the user. 

If the program that is executed  by such a command doesn't need to tell
the user anything, then it will probably work from the run prompt box as
well as in a terminal. As will those that can open their own terminal
window or some other gui interface.  

> What these different commands stand for ?

If you really want to know more about the commands available to you on
your linux system, might I suggest opening a terminal window and then
typing one of these,

ls /bin
ls /sbin
ls /usr/bin
ls /usr/sbin

There are others but these will show you many command names. (though
generally the ones in the sbin directories need super user permissions
which in ubuntu usually means you used sudo to start it.

Then (again in a terminal) type "man " followed by one of the command
names the above "ls" commands showed you. I'd suggest starting with:

man man 

Which will display the online manual for the online manual... You can
scroll the text with the up/down arrows or the pageup/pagedown keys. Read
as much as you can absorb, then type a q to quit...

Then it might make sense to try:

man sudo

And then continue with the other listed command names. 

Note the list of commands will be too long to fit on the screen at once
so you may want to use the terminal window's scroll bar to see the rest
of the list...

Hope this helps.

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