Finding knowledge
In much of the above discussion there is only a hint of how some of the useful
programs work for you to make using a Linux system possible. The Debian
system comes with much  on line  documentation. It is Debian Policy that
every program has a man page. In addition, many packages also provide info
pages.
How does this help when you may not even know the command name? Linux
also provides the apropos command. If you give apropos a word, it will search
certain portions of the man pages looking for that word. For instance the
command:
apropos printer
will produce output something like:
banner (6)   print large banner on printer
lpc (8)   line printer control program
lpd (8)   liner printer spooler daemon
lprm (1)   remove jobs from the line printer queue
pac (8)   printer/plotter accounting information
print (3ncurses)   ship binary data to printer
printcap (5)   printer capability data base
Thus apropos can lead you to the man page entry for the topic of interest. In
the previous list the command lpc looks interesting, and we didn't discuss it
when talking about printers. This program is mostly of interest to the System
Administrator, but that could be you, so take a look at the man page by
entering the command:
man lpc
The man program will format text to your screen through the pager assigned
to that task (the default is more). man recognizes the PAGER environment
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