Linux directory structure

Directory	Description
/	The top-level directory. Start of all directories.
/bin	The directory where Linux basic commands are located.
/etc	The directory where system configuration files are located.
/etc/mail	Mail related setting directory.
/etc/ssh	SSH related setting directory.
/etc/squid	Squid proxy server related setting directory.
/etc/samba	Samba related setting directory.
/etc/skel	The directory where the initialization files are located for creating an account.
/etc/rc?.d	The directory where the link files of each runlevel script are located.
/etc/init.d	The directory where the actual files of each runlevel script are located.
/etc/pam.d	PAM related setting directory.
/etc/httpd	Apache server related setting directory.
/etc/cron.*	Cron related setting directory.
/etc/xinetd.d	Xinetd demon related setting directory.
/root	The root account's home directory.
/boot	The directory where the kernel image and boot information files are located.
/home	The directory where the normal users' home directories are located.
/media /mnt	The directory where detachable devices are located. It is used as a mount point.
/tmp	The public directory available to all users.
/var	Directory where temporary data such as system log files are located.
/var/tmp	The public directory available to all users.
/var/log	The directory where log files are located.
/var/ftp	The home directory of the FTP service.
/var/named	The directory where DNS zone files are located.
/var/spool/mail	The directory where users' mail files are located.
/var/spool/lpd	The temporary directory for printing.
/var/spool/mqueue	Directory where mailes are located temporarily.
/var/spool/cron	The directory where user's crond configuration files are located.
/var/spool/at	The directory where user's atd configuration files are located.
/dev	The directory where device files are located.
/usr	The directory where most programs and libraries for general users are located.
/usr/sbin /usr/bin	The directory where commands for general users are located..
/usr/include /usr/lib	The directory where header files for programing are located.
/usr/src	The directory where source code files of kernel are located.
/usr/local	The directory for installing a software.
/usr/share/man	The directory where man page files are located.
/lost+found	The directory where files with problem are located.
/lib	The directory where library files are located.
/sbin	The directory where command for system administration are located.
/proc	The directory that provides tasks existing in the memory as a file format.