NAME

       exifgrep - select and reformat the output of exifprobe

SYNOPSIS

       exifgrep [options] [egrep_options] egrep_pattern [NOT egrep-pattern] filename(s)

DESCRIPTION

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

OPTIONS

       -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 numbers.

       -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  reformat.sh  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" expression.

       All remaining arguments are interpreted as image filenames.

SEE ALSO

       exifprobe(1)

AUTHOR

       Duane H. Hesser
       dhh@virtual-cafe.com

                                              LOCAL                                   EXIFGREP(1)