/usr/bin, /usr/
sbin
/usr/share/doc
/tmp, /var/tmp
/opt
/proc
/sys
/var/log
18.1.3 Working with Directories and Files
To address a certain file or directory, you must specify the path leading to that directory
or file. There are two ways to specify a path:
• The entire (absolute) path from the root directory to the respective file
• A path starting from the current directory (relative path)
Absolute paths always start with a slash. Relative paths do not have a slash at the begin-
ning.
NOTE: Linux Is Case-Sensitive
Linux distinguishes between uppercase and lowercase in the file system. For
example, entering test.txt or Test.txt makes a difference in Linux. Keep
this in mind when entering filenames or paths.
To change directories, use the cd command.
Generally accessible programs (/usr/bin) and reserved
for the system administrator ( /usr/sbin)
Various documentation files
Temporary files (do not save files in this directory unless
you do not need them)
Optional software, larger add-on program packages (such
as KDE, GNOME, and Netscape)
Process file system
System file system where all device information for the
kernel is gathered
System log files
Working with the Shell
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