diff

UNIX下FILE命令的实现源码

#------------------------------------------------------------------------------
# diff:  file(1) magic for diff(1) output
#
0	string		diff\ 	'diff' output text
0	string		***\ 		'diff' output text
0	string		Only\ in\ 	'diff' output text
0	string		Common\ subdirectories:\ 	'diff' output text

# xdelta is like diff(1) for binary files (works for text, too).
# Available from: ftp://ftp.xcf.berkeley.edu/pub/xdelta/
0       string          %XDZ            xdelta diff file
>4      string          >%              version %.3s