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       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
       exifprobe -L,  permitting  easy  selection  and  minor  reformatting of
       output items.

       exifprobe is small, fast, and utterly  sycophantic  in  its  desire  to
       report  everything  it finds in an image.  exifgrep applies the regular
       expression matching capabilities of egrep  to  the  output  barrage  to
       extract 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
       readable" 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
       eliminates  whitespace, providing a format which typical shells may use
       directly 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
                 output, 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

       -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
                 export 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
       representing  matches  to  be rejected.  This pattern will be passed to
       egrep -v.  Only one argument  of  each  type  may  be  given,  and  the
       "accept"   expression  (if  given)  must  appear  before  the  "reject"

       All remaining arguments are interpreted as image filenames.




       Duane H. Hesser