Information Technology Reference
In-Depth Information
/
home
tom
todo
Work
Class
OS
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hw1.txt
Figure11.3: Example of a directed acyclic graph directory organization with
multiple hard links to a file.
. and .. and ˜
You may sometimes see path names in which directories are named
.
,
..
, or
~
. E.g.,
>cd~/Work/Class/OS
>cd..
>./a.out
.
,
..
, and
~
are special directory names in Unix.
.
refers to the current working
directory,
..
refers to the parent of the current working directory, and
~
refers to the
current user's home directory.
So, the first shell command changes the current working directory to be the
Work/
Class/OS
directory in the user's home directory (e.g.,
/home/tom/Work/Class/OS
). The
second command changes the current working directory to be the
Work/Class
directory
in the user's home directory (e.g.,
~
/Work/Class
or
/home/tom/Work/Class
.) The third
command executes the program
a.out
from the current working directory (e.g.,
~
/Work/
Class/a.out
or
/home/tom/Work/Class/a.out
.)
