exif: add page (#4670)

pages/linux/exif.md

@@ -0,0 +1,24 @@
+# exif
+
+> Show and change EXIF information in JPEG files.
+> More information: <https://github.com/libexif/exif/>.
+
+- Show all recognized EXIF information in an image:
+
+`exif {{path/to/image.jpg}}`
+
+- Show a table listing known EXIF tags and whether each one exists in an image:
+
+`exif --list-tags --no-fixup {{image.jpg}}`
+
+- Extract the image thumbnail into the file thumbnail.jpg:
+
+`exif --extract-thumbnail --output={{thumbnail.jpg}} {{image.jpg}}`
+
+- Show the raw contents of the "Model" tag in the given image:
+
+`exif --ifd={{0}} --tag={{Model}} --machine-readable {{image.jpg}}`
+
+- Change the value of the "Artist" tag to John Smith and save to new.jpg:
+
+`exif --output={{new.jpg}} --ifd={{0}} --tag="{{Artist}}" --set-value="{{John Smith}}" --no-fixup {{image.jpg}}`