under Unix thehighest level–the root–of the filesystem is always designated with the single character"/" and it always contains the same set of top-level directories:

/usr/etc/var/bin/proc/boot/home/root/sbin/dev/lib/tmp

and each of these directories typically has its own distinct structure of subdirectories.Note the obsessive use of abbreviations and avoidance of capital letters; this is a systeminvented by people to whom repetitive stress disorder is what black lung is to miners.Long names get worn down to three-letter nubbins, like stones smoothed by a river.