Directory	Description
/	This is the root directory which should contain only the directories needed at the top level of the file structure.
/bin	This is where the executable files are located. They are available to all user.
/dev	These are device drivers.
/etc	Supervisor directory commands, configuration files, disk configuration files, valid user lists, groups, ethernet, hosts, where to send critical messages.
/lib	Contains shared library files and sometimes other kernel-related files.
/boot	Contains files for booting the system.
/home	Contains the home directory for users and other accounts.
/mnt	Used to mount other temporary file systems, such as cdrom and floppy for the CD-ROM drive and floppy diskette drive, respectively
/proc	Contains all processes marked as a file by process number or other information that is dynamic to the system.
/tmp	Holds temporary files used between system boots
/usr	Used for miscellaneous purposes, or can be used by many users. Includes administrative commands, shared files, library files, and others
/var	Typically contains variable-length files such as log and print files and any other type of file that may contain a variable amount of data
/sbin	Contains binary (executable) files, usually for system administration. For example fdisk and ifconfig utlities.
/kernel	Contains kernel files

Command	Description
cat filename	Displays a filename.
cd dirname	Moves you to the directory identified.
cp file1 file2	Copies one file/directory to specified location.
file filename	Identifies the file type (binary, text, etc).
find filename dir	Finds a file/directory.
head filename	Shows the beginning of a file.
less filename	Browses through a file from end or beginning.
ls dirname	Shows the contents of the directory specified.
mkdir dirname	Creates the specified directory.
more filename	Browses through a file from beginning to end.
mv file1 file2	Moves the location of or renames a file/directory.
pwd	Shows the current directory the user is in.
rm filename	Removes a file.
rmdir dirname	Removes a directory.
tail filename	Shows the end of a file.
touch filename	Creates a blank file or modifies an existing file.s attributes.
whereis filename	Shows the location of a file.
which filename	Shows the location of a file if it is in your PATH.

Column	Description
Filesystem	The physical file system name.
kbytes	Total kilobytes of space available on the storage medium.
used	Total kilobytes of space used (by files).
avail	Total kilobytes available for use.
capacity	Percentage of total space used by files.
Mounted on	What the file system is mounted on.

Command	Description
quota	Displays disk usage and limits for a user of group.
edquota	This is a quota editor. Users or Groups quota can be edited using this command.
quotacheck	Scan a filesystem for disk usage, create, check and repair quota files
setquota	This is also a command line quota editor.
quotaon	This announces to the system that disk quotas should be enabled on one or more filesystems.
quotaoff	This announces to the system that disk quotas should be disabled off one or more filesystems.
repquota	This prints a summary of the disc usage and quotas for the specified file systems

$df -k
Filesystem      1K-blocks      Used   Available Use% Mounted on
/dev/vzfs        10485760   7836644     2649116  75% /
/devices                0         0           0   0% /devices
$

						
The du Command:

$du /etc
10     /etc/cron.d
126    /etc/default
6      /etc/dfs
...
$

						

$du -h /etc
5k    /etc/cron.d
63k   /etc/default
3k    /etc/dfs
...
$

						
Mounting the File System:

$ mount
/dev/vzfs on / type reiserfs (rw,usrquota,grpquota)
proc on /proc type proc (rw,nodiratime)
devpts on /dev/pts type devpts (rw)
$

						

mount -t file_system_type device_to_mount directory_to_mount_to

						

$ mount -t iso9660 /dev/cdrom /mnt/cdrom

						
Unmounting the File System:

$ umount /dev/cdrom