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EXIFGREP(1)		    General Commands Manual		   EXIFGREP(1)

       exifgrep	- select and reformat the output of exifprobe

       exifgrep	 [options]  [egrep_options]  egrep_pattern [NOT	egrep-pattern]

       Exifgrep	is a shell script which	applies	egrep(1) to the	output of  ex-
       ifprobe -L,  permitting easy selection and minor	reformatting of	output

       exifprobe is small, fast, and utterly sycophantic in its	desire to  re-
       port everything it finds	in an image.  exifgrep applies the regular ex-
       pression	matching capabilities of egrep to the output  barrage  to  ex-
       tract only wanted information.

       exifgrep	also performs a	mild form of selection on the output fields of
       exifprobe -L.  Many items reported by exifprobe are represented in  the
       image file by a number which compactly represents a defined value.

       E.g. exifprobe -L may report

       TIFF.Ifd1.ResolutionUnit		     = 2 = 'pixels per inch'

       where  the value	"2" must be interpreted	to mean	that resolution	values
       (TIFF.IFd1.Xresolution and IFF.IFd1.YResolution)	are recorded in	pixels
       per  inch,  rather than,	say, pixels per	centimeter.  exifprobe reports
       both fields; exifprobe may also report  interpreted  values  for	 items
       which are recorded in unfamiliar	units, such as

       JPEG.APP1.Ifd0.Exif.FNumber	     = 5.6 APEX	= 'f7.0'

       In  all such cases, exifgrep reports (by	default) only the "human read-
       able" field:

       TIFF.Ifd1.ResolutionUnit	= 'pixels per inch'
       JPEG.APP1.Ifd0.Exif.FNumber = 'f7.0'

       unless the "-num" option	is given to select the numerical value.

       In addition, a `variable' format	may be selected	("-var") which	elimi-
       nates  whitespace,  providing a format which typical shells may use di-
       rectly to set variables for further processing.	E.g.

       TIFF.Ifd1.ResolutionUnit='pixels	per inch'

       -r	 file arguments	may be directories, which will be searched via
		 find for all image types recognized by	exifprobe.

       -n	 force exifprobe to print a filename for each line of its out-
		 put, which exifgrep will turn into a comment at  the  end  of
		 each matching line.

       -t	 force exifprobe to print tag numbers for all itemes that have
		 them, so that matches may be made on hex or decimal tag  num-

       -c	 turn on color output from exifprobe

       -h	 print a usage message (help)

       -var	 report	 in "variable" format, which may be directly `sourced'
		 by any	Bourne-compatible shell	(except	that most shells  will
		 insist	that the dots must be replaced,	e.g. by	underscores).

       -export	 report	in "variable" format, but with a Bourne-compatible ex-
		 port command

       -num	 report	numerical values rather	than interpreted strings,  for
		 fields	which have both.

       NOTE:  the  -var	and -export options are	obsolescent; they are retained
       for compatibility with earlier versions of exifprobe.  A	post-processor
       such  as  may be more effective for	the current version if
       shell-compatible	output is desired.

       Any option not recognized by the	script will be passed on to egrep.

       The first non-option argument will be used as  the  pattern  passed  to
       egrep.	This may be followed by	the keyword NOT	and an expression rep-
       resenting matches to be rejected.  This pattern will be passed to egrep
       -v.   Only one argument of each type may	be given, and the "accept" ex-
       pression	(if given) must	appear before the "reject" expression.

       All remaining arguments are interpreted as image	filenames.


       Duane H.	Hesser

				     LOCAL			   EXIFGREP(1)


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