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= Exiftool =

To see all available date/time fields in the file(s), use

  exiftool -args -time:all *.jpg

== Exif rename by date

Add the original Exif date to the beginning of the file name, and also move the file to a folder by year-month.

When using ''-testname'' instead of the real ''-filename'', it only prints what it would do.

<code bash>
# set destination to a different path
dest=/path/to/by_month

# test what it would do
exiftool -d "$dest/%Y-%m/%Y-%m-%d_%%f-v%%02.c.%%e" '-testname<DateTimeOriginal' /path/to/process

# do it
exiftool -d "$dest/%Y-%m/%Y-%m-%d_%%f-v%%02.c.%%e" '-filename<DateTimeOriginal' /path/to/process
</code>

To also process subdirectories, add the ''-r'' (or ''-recurse'') option

To only process files with a .jpg extension, use ''-ext jpg'' (case insensitive)

Example to rename all ".DNG" files in the current directory and it's subdirectories (without moving them):

<code bash>
exiftool -r -ext dng -d "%Y-%m-%d_%%f-v%%02.c.%%e" '-testname<DateTimeOriginal' .
</code>

Special variables in the ''-d'' specification:

  * ''<nowiki>%%f</nowiki>''  : original filename (basename) without extension
  * ''<nowiki>%%02.c</nowiki>'' : Numbering in case of duplicates: "00", "01", etc.
  * ''<nowiki>%%e</nowiki>'' : extension

After the Exif rename, remove the unneeded "-v00" extension in the destination:
 
<code bash>
find "$dest" -iname "*-v00.jpg" -exec rename -v 's/-v00(\.jpg)/$1/i' {} +
</code>

== Set file time to Exif DateTimeOriginal 

  exiftool '-FileModifyDate<DateTimeOriginal' * 

or 

  * ''-ext jpg'' : only .JPG files (case-insensitive)
  * ''-r'' : Recursive (also process subfolders)       

  exiftool -r -ext jpg '-FileModifyDate<DateTimeOriginal' /path/to/process

== Copy JPEG Comment to Exif UserComment

For all .jpg files in current directory:

<code bash>
for f in *.jpg; do exiftool "-EXIF:UserComment<FILE:Comment" "$f"; done
</code>

== See also

 * https://exiftool.org/filename.html and the [[https://exiftool.org/faq.html|ExifTool FAQ]]
 * This guy's Exiftool Cheatsheet : https://gist.github.com/rjames86/33b9af12548adf091a26
 * And this even better one: [[https://ozzyczech.cz/bash/exiftool-tips-and-tricks/|Exiftool tips & tricks]]
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