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)