Helpful bash exiftool related functions to set various EXIF and date/time values on pics and movies files.

.exiftool_bash_aliases

###############################################################################
#
# EXIFTOOL related commands
#
###############################################################################
if [ ! -f ~/EXIF_format.fmt ]
then
cat > ~/EXIF_format.fmt << EOF
#[HEAD]Directory|FileName|Make|DateTimeOriginal|FileModifyDate|CreateDate|Keywords|Subject|ImageOrientation|Caption-Abstract|ModifyDate|Description
\$Directory|\$FileName|\$Make|\$DateTimeOriginal|\$FileModifyDate|\$CreateDate|\$Keywords|\$Subject|\$ImageOrientation|\$Caption-Abstract|\$ModifyDate|\$Description
EOF
fi

#==============================================================================
# Shows EXIF info and Date/Time info
#------------------------------------------------------------------------------
function exif() {
	exiftool -r -d """%Y:%m:%d %H:%M:%S""" -p """~/EXIF_format.fmt""" -f "$@"
}
export -f exif

#==============================================================================
# Sets CreateDate, FileModifyDate and ModifyDate (OS related) based on EXIF OriginalDate
#------------------------------------------------------------------------------
function exiforiginaldate () {
	echo Performing... """-CreateDate\<DateTimeOriginal""" """-FileModifyDate\<DateOriginalDate"""
	exiftool -d """%Y:%m:%d %H:%M:%S""" -overwrite_original_in_place -fileOrder DateTimeOriginal """-CreateDate<DateTimeOriginal""" """-FileModifyDate<DateTimeOriginal""" """-ModifyDate<DateTimeOriginal""" -v "$@"
}
export -f exiforiginaldate

#==============================================================================
# Sets OriginalDate and FileModifyDate based on EXIF CreateDate
#------------------------------------------------------------------------------
function exifcreatedate (){
	echo Performing... ""-DateTimeOriginal\<CreateDate"" ""-FileModifyDate\<CreateDate""
	exiftool -d """%Y:%m:%d %H:%M:%S""" -overwrite_original_in_place -fileOrder DateTimeOriginal """-DateTimeOriginal<CreateDate""" """-FileModifyDate<CreateDate""" -v "$@" 
}
export -f exifcreatedate

#==============================================================================
# Sets OriginalDate and CreateDate based on EXIF FileModifyDate
#------------------------------------------------------------------------------
function exifmodifydate () {
	echo Performing... ""-DateTimeOriginal\<FileModifyDate"" ""-CreateDate\<FileModifyDate""
	exiftool -overwrite_original_in_place """-DateTimeOriginal<FileModifyDate""" """-CreateDate<FileModifyDate""" """-ModifyDate<FileModifyDate""" -P -v "$@"
}
export -f exifmodifydate

#==============================================================================
# Convert a .PNG (limited EXIF support) to .JPG while copying as many tags as
# possible.
#------------------------------------------------------------------------------
function exifpng2jpg() {
# Command which convert .PNG files into .JPG and copies EXIF fields ...

	for a in "$@"
	do
		fname=`basename "$a" .png`
		xtension=png
		echo 1st -  ${fname}.${xtension}

		if [ \( -f "${fname}".png -o -f "${fname}".PNG \) -a ! -f "${fname}".jpg  ]
		then
			echo ok -  ${fname}.${xtension}
			sips -s format jpeg -s formatOptions 90 """${fname}".${xtension}"" --out """${fname}".jpg""
			exiftool -overwrite_original_in_place -TagsFromFile "${fname}".${xtension} "-all:all>all:all" "${fname}".jpg
		else
			fname=`basename "$a" .PNG`
			xtension=PNG
			echo 2nd -  ${fname}.${xtension}

			if [ \( -f "${fname}".png -o -f "${fname}".PNG \) -a ! -f "${fname}".jpg  ]
			then
				echo ok -  ${fname}.${xtension}
				sips -s format jpeg -s formatOptions 90 """${fname}".${xtension}"" --out """${fname}".jpg""
				exiftool -overwrite_original_in_place -TagsFromFile "${fname}".${xtension} "-all:all>all:all" "${fname}".jpg
			fi
		fi	
	done
}  
export -f exifpng2jpg

#==============================================================================
# Convert a .TIF (limited EXIF support) to .JPG while copying as many tags as
# possible.
#------------------------------------------------------------------------------
function exiftif2jpg() {
# Command which convert .TIF files into .JPG and copies EXIF fields ... Uses ModifyDate as the source for DateTimeOriginal, FileModifyDate, CreateDate fields

	for a in "$@"
	do
		fname=`basename "$a" .tif`
		dname=`dirname "$a" `
		if [ -f "${dname}/${fname}".tif -a ! -f "${dname}/${fname}".jpg  ]
		then
			echo ok -  ${fname}
			sips -s format jpeg -s formatOptions 100 """${dname}/${fname}".tif"" --out """${dname}/${fname}".jpg""
			exiftool -overwrite_original_in_place -TagsFromFile "${dname}/${fname}".tif "-all:all>all:all" "${dname}/${fname}".jpg
			echo Performing... ""-DateTimeOriginal\<FileModifyDate"" ""-CreateDate\<FileModifyDate"" on "${dname}/${fname}".jpg
			exiftool -overwrite_original_in_place """-DateTimeOriginal<ModifyDate""" """-CreateDate<ModifyDate""" """-FileModifyDate<ModifyDate""" -P -v "${dname}/${fname}".jpg
		fi	
	done
}  
export -f exiftif2jpg

#==============================================================================
# Sets OriginalDate
#------------------------------------------------------------------------------
function exifsetdate() {
	
	datetoset=${1}; echo $datetoset
	shift
	exiftool -d """%Y:%d:%m %H:%M:%S""" -overwrite_original_in_place -fileOrder DateTimeOriginal -DateTimeOriginal="""${datetoset}"""  -v "$@"
}
export -f exifsetdate

#==============================================================================
# Sets CreateDate
#------------------------------------------------------------------------------
function exifresetcreatedate() {
	
	datetoset=${1}; echo $datetoset
	shift
	exiftool -d """%Y:%d:%m %H:%M:%S""" -overwrite_original_in_place -fileOrder DateTimeOriginal -CreateDate="""${datetoset}"""  -v "$@"
}
export -f exifresetcreatedate

#==============================================================================
# Sets ModifyDate
#------------------------------------------------------------------------------
function exifresetmodifydate() {
	
	datetoset=${1}; echo $datetoset
	shift
	exiftool -d """%Y:%d:%m %H:%M:%S""" -overwrite_original_in_place -fileOrder DateTimeOriginal -FileModifyDate="""${datetoset}"""  -v "$@"
}
export -f exifresetmodifydate

#==============================================================================
# Sets OriginalDate, FileModifyDate and CreateDate
#------------------------------------------------------------------------------
function exifsetalldates() {
	
	datetoset=${1}; echo $datetoset
	shift
	exiftool -d """%Y:%d:%m %H:%M:%S""" -overwrite_original_in_place -fileOrder DateTimeOriginal -DateTimeOriginal="""${datetoset}""" -CreateDate="""${datetoset}""" -FileModifyDate="""${datetoset}""" -ModifyDate="""${datetoset}""" -v "$@"
}
export -f exifsetalldates

#==============================================================================
# Renames a file based on OriginalDate
#------------------------------------------------------------------------------
function exifrenamefile() {
	exiftool -v4 -r -d """IMG_%Y%m%d_%H%M%S%%-c.%%le""" '-filename<DateTimeOriginal' -f "$@"
	echo "Note: Do you need to run exiforiginaldate?"
}
export -f exifrenamefile

#==============================================================================
# exifaddsecs()
#   - number of seconds to add
# exiftool -overwrite_original_in_place  '-DateTimeOriginal+<0:$filesequence' -v *.JPG
#------------------------------------------------------------------------------
function exifaddsecs() {
E_BADARGS=85
E_BADFILES=90

	if [ ! -n "$1" ]
	then
		echo "Usage: exifaddsecs secs_to_add dstfile"
		echo "Usage: secs_to_add between 1 and 59 to DateTimeOriginal"
		echo "Usage: use exiforiginaldate afterwards as appropriate"
		return $E_BADARGS
	elif [ "$1" -gt 0 -a "$1" -lt 60 ]
	then
		secstoadd=${1}; echo $secstoadd
		shift

		echo Adding "${secstoadd}" to "$@"
		# with * it multiplies the filesequence by X seconds... so it is a geometric progression!
		# exiftool -overwrite_original_in_place '-datetimeoriginal+<0:0:${filesequence;$_*='$secstoadd'}' -v "$@"
		# exiftool -overwrite_original_in_place '-datetimeoriginal+<0:0:${filesequence;$_='$secstoadd'}' -v "$@"
		exiftool -overwrite_original_in_place '-datetimeoriginal+<0:0:${filesequence;$_*='$secstoadd'}' -v "$@"
	else
		echo "Usage: exifaddsecs secs_to_add dstfile"
		echo "Usage: secs_to_add between 1 and 59"
		echo "Usage: use exiforiginaldate afterwards as appropriate"
		return $E_BADFILES
	fi  
}
export -f exifaddsecs

#==============================================================================
# exifcopytags()
#   - srcfile
#   - dstfile
# Copy all metadata from one file to another
# exiftool -TagsFromFile srcimage.jpg "-all:all>all:all" targetimage.jpg
# USE -overwrite_original_in_place in applicable
# USE WITHOUT all:all will copy everything including GPS data (works with MP4)
#------------------------------------------------------------------------------
function exifcopytags() {
E_BADARGS=85
E_BADFILES=90

	if [ ! -n "$1" -o ! -n "$2" ]
	then
		echo "Usage: exifcopytags srcfile dstfile"
		return $E_BADARGS
	elif [ -f "$1" ]
	then
		srcfile=${1}; shift

		echo Copying all tags from "${srcfile}" to "$@"
		exiftool -v -overwrite_original_in_place -TagsFromFile "${srcfile}" "${@}"
	else
		echo "Usage: file(s) not found!"
		echo "Usage: exifcopytags srcfile dstfile"
		return $E_BADFILES
	fi  
}
export -f exifcopytags

#==============================================================================
# exifcleantags()
#   - files
# Clean all metadata from one file
# exiftool -overwrite_original -all= -gps:all= *.jpg
# USE -overwrite_original_in_place in applicable
#------------------------------------------------------------------------------
function exifcleantags() {
E_BADARGS=85
E_BADFILES=90

	if [ ! -n "$1" ]
	then
		echo "Usage: exifcleantags files"
		return $E_BADARGS
	elif [ -f "$1" ]
	then
		echo Cleaning all tags from "$@"
		exiftool -v -overwrite_original -all= -gps:all= "${@}"
	else
		echo "Usage: file(s) not found!"
		echo "Usage: exifcleantags files"
		return $E_BADFILES
	fi  
}
export -f exifcleantags

EXIF_format.fmt

#[HEAD]Directory|FileName|Make|DateTimeOriginal|FileModifyDate|CreateDate|Keywords|Subject|ImageOrientation|Caption-Abstract|ModifyDate|Description
$Directory|$FileName|$Make|$DateTimeOriginal|$FileModifyDate|$CreateDate|$Keywords|$Subject|$ImageOrientation|$Caption-Abstract|$ModifyDate|$Description