/usr - This is one of the most important directories in the system as it
contains all the user binaries. X and its supporting libraries can be
found here. User programs like telnet, ftp etc are also placed here.
/usr/doc contains useful system documentation. /usr/src/linux contains the
source code for the Linux kernel.
/var - This directory contains spooling data like mail and also the output
from the printer daemon. The system logs are also kept here in
/var/log/messages. You will also find the database for BIND in /var/named
and for NIS in /var/yp.
This was a short and basic look at the Linux filesystem. You do need to
have at least this basic knowledge of the layout of the filesystem to
fully utilize its potential. One good place to read about the filesystem
is this detailed document at www.pathname.com/fhs/1.2/fsstnd-toc.html that
specifies the standard structure of the Linux filesystem.
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