April 2010
Beginner
464 pages
12h 7m
English
Content preview from Ubuntu: Up and Running
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File Extensions
Another difference between Linux and Windows files is that Linux imposes no requirement for program files to use any particular extension, such as .exe or .dll. Instead, each file has an extended set of attributes that tell the operating system what it can do with the file. So, as well as having attributes for read-only, hidden, and system, such as you would use on Windows, there is also an executable attribute.
However, Linux does make good use of file extensions for data files, and they often use full terms such as .html and .jpeg instead the truncated, three-letter versions .htm and .jpg that grew up because of restrictions imposed by early Windows systems. Graphic files such as .gif, .tif, and .png files also retain their extensions, as do many other file types. Table 5-1 lists the main extension types and what they are generally used for in Ubuntu.
Table 5-1. Typical file extensions used in Ubuntu Linux
Extension | Type of file |
|---|---|
.0–.9 | Help pages for the man program, and old logfiles |
.asm | Assembly language program |
.au | Audio file |
.bmp | Graphic image |
.bz2 | A file compressed using the bzip2 program |
.c | C language program |
.class | Java language compiled program |
.cfg / .conf | Configuration file |
.cc / .cpp | C++ language program |
.css | Cascading style sheet |
.csv | Comma-separated value data file |
.db | Berkeley DB data file |
.deb | Debian application package |
.diff | File of differences generated by the diff program |
.dtd | Document type definition for XML data |
.gif | Graphic image |
.gz | File compressed using the gzip program |
.h | Header ... |
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