This ExifTool is a nice command line based tool that allows read and write of properties from Exif an others. It can easily be used in the shell to e.g. collect information about images or just to list all properties.
The tool can be used with no arguments like:
exiftool IMG_0001.jpg
resulting in the output:
Artist : Kenneth Lausdahl Exposure Time : 30 F Number : 9.0 Exposure Program : Manual ISO : 100 Exif Version : 0230 Date/Time Original : 2012:12:12 19:07:19 Create Date : 2012:12:12 19:07:19 Shutter Speed Value : 30 Aperture Value : 9.0 Exposure Compensation : 0 Max Aperture Value : 4.0 Metering Mode : Multi-segment Flash : Off, Did not fire Focal Length : 67.0 mm Sub Sec Time Original : 01 Sub Sec Time Digitized : 01 Focal Plane X Resolution : 4438.356164 Focal Plane Y Resolution : 4445.969125 Focal Plane Resolution Unit : inches Custom Rendered : Normal Exposure Mode : Manual White Balance : Auto
If only a single property is desired then this argument can be used to just extract the date from when the photo was taken:
exiftool IMG_0001.jpg -EXIF:DateTimeOriginal
When using this tool to sort some pictures, mainly removing duplicates, I came a across the small tool tag which allowed me to tag files in Mac from the terminal. This could then be used in combination with the ExifTool for marking duplicates.
tag -a IMG_0001.jpg
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