02 Sep 2008 Rename files by wildcard pattern and correct the EXIF timestamp metadata

This is a little script I’ve written to correct all my image files since the EXIF timestamp information is one hour out of sync. The filenames have been renamed to comply to the EXIF information and has to be renamed again because of the one hour scew. The filename can look something like this 20080102-1201_DSC_0910.JPG where the name is built up like YYYYMMDD-HHMM_Original_Filename.JPG
Remember to backup your imagefiles before you continue. You have been warned!

Rename files using wildcard pattern

This is the files we are going to rename

20080102-1201_DSC_0910.JPG
20080105-1923_DSC_1006.JPG
20080111-1220_DSC00189.JPG
20080122-0929_DSC00190.JPG

The mmv command is a command that lets you move/copy/append/link multiple files by wildcard patterns. It can be installed in Debian (or Debian based distributions like Ubuntu) by issuing the command

# aptitude install mmv

Now rename the files back to their original name

# mmv "*_DSC*" "DSC#2"

The result after this operation looks like this

DSC_0910.JPG
DSC_1006.JPG
DSC_1179.JPG
DSC_1302.JPG
DSC_1587.JPG

Correct the EXIF timestamp using exiv2

Next adjust the EXIF information stored in the image files to fix the one hour difference. This can be done using different EXIF tools like exiftool, but I will show you how it can be done using jhead and exiv2. The advantage with exiv2 is that it can also handle Nikon NEF files while jhead only can prosess JPG.

The current timestamp can be determined as follows

# exiftool DSC_0910.JPG | grep "File Mo"

The result in this case is

File Modification Date/Time : 2008:01:02 08:34:09

Adjust EXIF time info one hour forward using exiftool

# exiftool -AllDates+=1 DSC_0910.JPG

Other tools that could have done the job

Adjust EXIF time info one hour forward using jhead

# jhead -ta +1 DSC_0910.JPG

Install the jhead package using aptitude as mentioned earlier for the mmv package

Adjust EXIF time info one hour forward using exiv2

# exiv2 ad -a 1 DSC_0910.JPG

Rename files back to YYYYMMDD-HHMM_Original_Filename.JPG

It is now time to rename the files back to the YYYYMMDD-HHMM_Original_Filename.JPG format I used before this operation. This operation has been describe in a previous post named Rename image files according to EXIF date

exiv2 -r'%Y%m%d-%H%M_:basename:' rename $(ls D*)

The script

#!/bin/bash -x
# Needed software:
# exiftool
# exiv2
# mmv

# Script tested on Nikon D80 and Sony Cybershot DSC-W12 files

# Make a printout of how the files look like now
ls -l > repair_name_and_exif_before.txt

# Rename files to remove date formatting back to original name
mmv "*_DSC*" "DSC#2"

# Change EXIF info on JPG files (order is important)
exiftool -overwrite_original -AllDates+=1 D*.JPG
# Preserve date/time of original file when writing
exiftool -overwrite_original '-DateTimeOriginal>FileModifyDate' D*.JPG

# Change EXIF info on NEF files (order is important)
exiftool -overwrite_original -AllDates+=1 '-DateTimeOriginal>FileModifyDate' D*.NEF
# Preserve date/time of original file when writing
exiftool -overwrite_original '-DateTimeOriginal>FileModifyDate' D*.NEF

# Rename files back to date formatting (YYYYMMDD-HHMM_Filename) based on the new EXIF info
exiv2 -r'%Y%m%d-%H%M_:basename:' rename $(ls D*)

# Make a printout of how the files look like after conversion
ls -l > repair_name_and_exif_after.txt

Tags: Debian, EXIF, exiv2, jhead, JPG, mmv, NEF, Nikon, rename, Sony

Posted by Hans-Henry Jakobsen

exiv2 -pt picturename.JPG
...
Exif.Nikon3.ShutterCount                     Long        1  5263

#! /bin/shfunction usage() {

if [ $# -ne 1 ]; then
    echo "ExifDater - version 0.1 - March 23 2006"
    echo "El-Lotso ”
    echo “This  is  free  software;  see the source for copying conditions.”
    echo “There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR”
    echo “A PARTICULAR PURPOSE.”
    echo
    echo “ExifDater utilises the exiftags( http://johnst.org/sw/exiftags/)”
    echo “program to sequentially extract the image creation date from”
    echo “JPEG EXIF headers.”
    echo
    echo “Usage:”
    echo “$0 /path/to/jpg/directory”
    exit 0
fi
}

function exiftimexist(){
which exiftime > /dev/null 2>&1
if [ $? -ne 0 ]; then
    echo
    echo “Unable to locate exiftime binary”
    echo “Please make sure it is installed and is in your path.”
    echo
    exit 0
fi
}

function gotodir(){
cd $1 > /dev/null 2>&1

if [ $? -ne 0 ]; then
    echo
    echo “Directory does not exists”
    echo “Please try again.”
    echo
    exit 0
fi

}

function jpgexist(){
find . -iname “*.jpg” -type f >/dev/null 2>&1

if [ $? -ne 0 ]; then
    echo
    echo “There are no JPEG pictures in this directory”
    echo “Please try again.”
    echo
    exit 0
fi
}

function myexifdater(){
for i in *.jpg
do
    create_date=`exiftime “$i” 2>&1 | grep -i image created | cut -d” ” -f3 | sed -e ’s/:/-/g’`
    if [ “$create_date” == “” ]; then
        echo -e “SKIPPING IMAGE $i \t\t\t [NO EXIF DATA FOUND]”
        continue
    fi
    echo -n Processing Image $i Created on $create_date
    do_rename=$( echo $i | sed -e ’s/(.*)/mv “&” “‘$create_date’_1″/g’|sh)
    echo -e \t[DONE]

done
}

usage $1
exiftimexist
gotodir $1
jpgexist
myexifdater

jhead -ft -autorot *.JPG