adding addExifDate

shell/addExifDate.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+#
+# Requires "jhead" (yum/apt-get/pacman install jhead)
+#
+# a) add EXIF Date/Time headers to JPG files missing it
+# b) update on-disk Date/Time to just added EXIF header
+#
+# SPDX-License-Identifier: MIT
+
+DTS=""
+if [[ $# -ne 1 ]]; then
+  echo "Usage:  $0 <date/time stamp>"
+  echo "Format: YYYY:mm:dd-HH:MM:SS"
+  exit 1
+else
+  DTS="$1"
+fi
+
+for file in *.jpg *.jpeg *.JPG *.JPEG; do
+  if [[ ! -e "${file}" ]]; then
+    continue
+  fi
+  JPGDT=$(jhead "${file}" | grep "Date/Time")
+  JPGFC=$(jhead "${file}" | grep -c "Date/Time")
+  if [[ ${JPGFC} -gt 1 ]]; then
+    echo "Too many Date/Time results, skipping ${file}"
+    continue
+  elif [[ ${JPGFC} -eq 0 ]] || [[ "X${JPGDT}" == "X" ]]; then
+    echo "No valid Date/Time, adding to ${file}"
+    jhead -q -mkexif "${file}"
+    jhead -q -ts"${DTS}" "${file}"
+    jhead -q -ft "${file}"
+  else
+    echo "Existing Date/Time, skipping ${file}"
+    continue
+  fi
+done