Practical console applications

Ok so I was wondering, can I write anything actually useful that runs in the console? Like, can I write something that talks to the hardware? Or something that handles a database? I don't know, I'm really just looking for some input here. Im tired of writing useless so called learning applications. I've been doing this for a couple years now and I'm ready to move on.
Of course. DBMS, compilers, server applications, compression and conversion utilities are almost exclusively console programs.
Could you point me towards the libraries used for this? If there are standard libraries for all these that is
Ok so I was wondering, can I write anything actually useful that runs in the console


A GUI application is a console app with pictures to click instead of letters to type.

zlib is a well-known compression library: http://zlib.net/
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