.file_extensions.txt

.asc	ASCII (text) file
.awk	awk script
.bak	Backup copy of file
.bz2	bzip2 compressed file
.c	C program source code
.C	C++ program source code
.cc	C++ program source code
.cgi	CGI web page program
.dat	Data or other information
.doc	Explanatory text file
.dvi	DVI format document, produced by TeX/LaTeX
.el	Emacs Lisp source code
.elc	Compiled Emacs Lisp program
.f	Fortran source code
.f77	Fortran source code (f77 compiler)
.fig	Xfig data file
.for	Fortran source code (fort compiler)
.gif	GIF image file
.gz	gzip compressed file
.h	C or C++ program header file
.html	Hypertext Markup Language document
.info	Emacs TeXinfo file in "info" format
.jpg	Graphical image file in JPEG format
.log	Logged information
.m	Maple file
.mat	MATLAB script
.me	nroff input file for processing with -me option
.mpg	MPEG animation file
.ms	nroff input file for processing with -ms option
.o	Object code, produced by compilers
.pal	Xpaint palette file
.pbm	Portable bitmap
.pgm	Portable gray scale pixmap
.pl	Perl program
.png	PNG format graphics file (similar to GIF)
.ppm	Portable pixmap
.ps	PostScript format document
.py	Python program
.rast	Sun raster file
.rgb	SGI native image file
.shar	Shell archive (expand with sh file.shar)
.sh     Shell scrioty
.ss	Scheme source code
.S	Assembly (machine) code
.tar	Tape archive, used by tar command
.tar.gz	Tarred-then-gzipped files
.tex	TeX or LaTeX format document
.tif	TIFF (Adobe) image file
.tgz	Tarred-then-gzipped files (equivalent to .tar.gz)
.txt	Generic text file
.uue	uuencoded file
.xbm	X bitmap
.z	Packed file (from the pack command) or early gzip file
.Z	Compressed file, from compress command
.zip	Zipped (compressed) file, from zip command