Show or Update the exif ImageDescription and DateTimeOriginal in command line

exif.sh

#!/usr/bin/env bash

# exif.sh

# usage

usage_exit() {
    if [[ $1 ]]; then echo "error $1"; fi
    echo "---
Usage:

$CMDNAME [-d \"DECRIPTION\"] [-t \"YYYY:MM:DD HH:MM:SS\"] FILENAME [FILENAME ...]

FILENAME: .*\.(jpg|jpeg|JPG|JPEG)

-d DECRIPTION: this will be written in ImageDescription field 

-t : DateTimeOriginal field. Default value is CreateDate


For malti files, use `-` pipe indicator

ls | $CMDNAME -d \"DECRIPTION\" [-t \"YYYY:MM:DD HH:MM:SS\"] -

ls should return list of .*\.(jpg|jpeg|JPG|JPEG) with space delimiter

---
";
    OPTIND=$OPTIND_OLD
    exit 1
}

# init

CMDNAME=`basename $0`
OPTIND_OLD=$OPTIND
OPTIND=1

# option

while getopts d:t:h OPT
do
  case $OPT in
    d ) DESC=$OPTARG ;;
    t ) DATE=$OPTARG
        OPT_DATE=1 ;;
    h ) usage_exit ;;
  esac
done

# 変数 OPTIND には次に処理する引数の番号が格納されている
# 「処理したオプションの個数」だけ shiftで 位置パラメータの内容をずらす
shift `expr $OPTIND - 1`
# shift  $(($OPTIND - 1)) 上と同じ処理

if [[ ! $1 = "-" ]] && [[ ! -f $1 ]]; then usage_exit "option" ; fi

if [[ $1 = "-" ]] ; then # [[ ... ]] 引数有無判定のメッセ消し
    files=$(cat)
else
    files=$@
fi


# main

for FILE in $files
do
    if [ -s $FILE ] && [[ $FILE =~ ^.*\.(jpg|JPG|jpeg|JPEG)$ ]] ; then #クォートはマルチバイト文字対応

        if [ ! $DESC ] ; then
            exiftool $FILE | grep -i -E "Image.*Description|Date.*Time.*Original|Create.*Date"
        else
            if [ ! $OPT_DATE ] ; then #クォートは空白文字対応
                D=`exiftool -CreateDate $FILE`
                if [[ $D ]] ; then
                    DATE=${D#*: } #左端からのパターン一致除外
                else
                    DATE=$(date '+%Y:%m:%d %T')
                fi
            fi
            
            echo "    $FILE";
            echo "    ImageDescription=$DESC";
            echo "    DateTimeOriginal=$DATE";
            exiftool -ImageDescription="$DESC" -DateTimeOriginal="$DATE" -overwrite_original $FILE
        fi
        
    else
        usage_exit "file: $FILE"
    fi
done

# cleaner

OPTIND=$OPTIND_OLD