Filesystem The Linux Filesystem The directories you will find most useful are: /bin - basic programs (ls, cd, cat, etc.) /sbin - system programs (fdisk, mkfs, sysctl, etc) /etc - configuration files /tmp - temporary files (typically deleted on boot) /usr/bin - applications (apt, ncat, nmap, etc.) /usr/share - application support and data files There are many other directories, most of which you will rarely need to enter, but having a good familiarity of the layout of the Linux filesystem will help your efficiency immensely.