Unix Primer A

By any measure and all accounts, Unix is the most efficient and dependable
operating system.

Like C++, Unix is case sensitive. The command or nameaginarais not
the same asAginara.

To use a Unix computer, we need an account. Once this is established,
we log in by typing the username and password in response to a prompt. To
log out, we type:
logout

To change the password, we type:

passwd

A Unix file system can be regarded as a file cabinet accessible at amount
point. A file system can be mounted or unmounted manually or automatically
when a recordable medium, such as a hard drive or a CD-ROM, is attached.
File systems have different types such asext3,orntfs.

Each folder (directory) of a file system contains subfolders (subdirecto-
ries) and documents (files). Ancillary files whose names begin with a dot, such
as.simos, are hidden from plain view. The directories are thus arranged in a
pyramidal, tree-like structure. The top directory at the apex, denoted by a
slash (/), is called the root. A typical directory structure is shown below:

/bin /boot /dev /home /usr ...

/home/pangalos /home/karaiskakis

/