これはどう?
PROMPT> ls * | sed 's/^.*$/"&"/g' | xargs file
IREffectFilter.m: ASCII C++ program text, with CRLF line terminators
MacBook Air.spx: XML document text
PGFilteredImageView.m: ASCII C++ program text
Screen Shot 2012-09-27 at 1.33.50 PM.png: PNG image data, 559 x 152, 8-bit/color RGB, non-interlaced
Screen Shot 2012-10-02 at 10.04.37 AM.png: PNG image data, 880 x 1136, 8-bit/color RGBA, non-interlaced
Screen Shot 2012-10-02 at 2.08.53 PM.png: PNG image data, 937 x 1158, 8-bit/color RGB, non-interlaced
Screen Shot 2012-10-03 at 9.50.16 AM.png: PNG image data, 651 x 347, 8-bit/color RGB, non-interlaced
Screen Shot 2012-10-08 at 11.14.51 AM.png: PNG image data, 1343 x 1528, 8-bit/color RGBA, non-interlaced
Screen Shot 2012-10-08 at 12.09.01 PM.png: PNG image data, 880 x 1136, 8-bit/color RGBA, non-interlaced
Screen Shot 2012-10-08 at 12.29.16 PM.png: PNG image data, 880 x 1136, 8-bit/color RGBA, non-interlaced
Screen Shot 2012-10-09 at 8.44.05 AM.png: PNG image data, 880 x 1136, 8-bit/color RGBA, non-interlaced
Screen Shot 2012-10-11 at 4.17.14 PM.png: PNG image data, 880 x 1136, 8-bit/color RGBA, non-interlaced
breakpoint1.sh: Bourne-Again shell script text executable
breakpoint2.sh: Bourne-Again shell script text executable
bugtracker.txt: UTF-8 Unicode text
error_svn_rename.txt: UTF-8 Unicode English text
long_text.txt: data