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<PRE>
<!-- Manpage converted by man2html 3.0.1 -->
<B>EXIFGREP(1)</B> <B>EXIFGREP(1)</B>
<B>NAME</B>
exifgrep - select and reformat the output of <B>exifprobe</B>
<B>SYNOPSIS</B>
<B>exifgrep</B> [options] [<I>egrep</I><B>_</B><I>options</I>] <I>egrep</I><B>_</B><I>pattern</I> [<I>NOT</I> <I>egrep-pattern]</I>
<I>filename(s)</I>
<B>DESCRIPTION</B>
<B>Exifgrep</B> is a shell script which applies <B>egrep(1)</B> to the output of
<B>exifprobe</B> <I>-L</I>, permitting easy selection and minor reformatting of out-
put items.
<B>exifprobe</B> is small, fast, and utterly sycophantic in its desire to
report <I>everything</I> it finds in an image. <B>exifgrep</B> applies the regular
expression matching capabilities of <B>egrep</B> to the output barrage to
extract only wanted information.
<B>exifgrep</B> also performs a mild form of selection on the output fields of
<B>exifprobe</B> <I>-L</I>. Many items reported by exifprobe are represented in the
image file by a <I>number</I> which compactly represents a defined value.
E.g. <B>exifprobe</B> <I>-L</I> may report
TIFF.Ifd1.ResolutionUnit = 2 = 'pixels per inch'
where the value "2" must be interpreted to mean that resolution values
(<I>TIFF.IFd1.Xresolution</I> and IFF.IFd1.YResolution) are recorded in pixels
per inch, rather than, say, pixels per centimeter. <B>exifprobe</B> reports
both fields; <B>exifprobe</B> 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, <B>exifgrep</B> reports (by default) only the "human read-
able" field:
TIFF.Ifd1.ResolutionUnit = 'pixels per inch'
JPEG.APP1.Ifd0.Exif.FNumber = 'f7.0'
unless the "<I>-num</I>" option is given to select the numerical value.
In addition, a `variable' format may be selected ("<I>-var</I>") which elimi-
nates 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'
<B>OPTIONS</B>
-r <I>file</I> arguments may be directories, which will be searched via
<B>find</B> for all image types recognized by <B>exifprobe</B>.
-n force <B>exifprobe</B> to print a filename for each line of its out-
put, which <I>exifgrep</I> will turn into a comment at the end of
each matching line.
-t force <B>exifprobe</B> 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 <B>exifprobe</B>
-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
<I>export</I> command
-num report numerical values rather than interpreted strings, for
fields which have both.
NOTE: the <I>-var</I> and <I>-export</I> options are obsolescent; they are retained
for compatibility with earlier versions of <I>exifprobe</I>. A post-processor
such as <I>reformat.sh</I> 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 <B>egrep</B>.
The first non-option argument will be used as the pattern passed to
<B>egrep</B>. This may be followed by the keyword <I>NOT</I> and an expression rep-
resenting matches to be <I>rejected</I>. This pattern will be passed to <B>egrep</B>
<I>-v</I>. 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.
<B>SEE</B> <B>ALSO</B>
<B>exifprobe(1)</B>
<B>AUTHOR</B>
Duane H. Hesser
dhh@virtual-cafe.com
LOCAL <B>EXIFGREP(1)</B>
</PRE>
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