影像處理與地理定位資訊解析

#!/bin/bash
# thumbnails - 生成不同尺寸的縮圖
if [ $# -eq 0 ]; then
  echo "用法: $0 (-e|-f) 縮圖尺寸 圖片檔案 [圖片檔案] ..."
  exit 1
fi

while getopts ":ef:s" opt; do
  case $opt in
    e) exact=true ;;
    f) exact=false ;;
    s) strip=true ;;
    \?) echo "無效選項: -$OPTARG"; exit 1 ;;
  esac
done

shift $((OPTIND-1))
size=$1
shift

for file in "$@"; do
  if [ "$exact" = true ]; then
    convert "$file" -resize "$size"! "${file%.*}_${size}.jpg"
  else
    convert "$file" -resize "$size>" "${file%.*}_${size}.jpg"
  fi
  
  if [ "$strip" = true ]; then
    mogrify -strip "${file%.*}_${size}.jpg"
  fi
done

#!/bin/bash
# geoloc - 將圖片中的GPS資訊轉換為可用的地理定位字串

tempfile="/tmp/geoloc.$$"
trap "rm -f $tempfile" 0 1 15

if [ $# -eq 0 ]; then
  echo "用法: $0 圖片檔案" >&2
  exit 1
fi

for filename in "$@"; do
  identify -format "%[EXIF:*]" "$filename" | grep GPSL > $tempfile
  
  latdeg=$(head -1 $tempfile | cut -d, -f1 | cut -d= -f2)
  latdeg=$(scriptbc -p 0 $latdeg)
  latmin=$(head -1 $tempfile | cut -d, -f2)
  latmin=$(scriptbc -p 0 $latmin)
  latsec=$(head -1 $tempfile | cut -d, -f3)
  latsec=$(scriptbc $latsec)
  
  # ... (省略其他GPS資訊提取與計算)
  
  echon "座標: $latdeg ${latmin}' ${latsec}\" $latorientation, "
  echo "$longdeg ${longmin}' ${longsec}\" $longorientation"
done

exit 0

if [ $(date -d 12/31/$year +%j) -eq 366 ]; then
    echo "$year 是閏年"
fi

#!/bin/bash
# dayinpast：給定日期，報告當天是星期幾

if [ $# -ne 3 ]; then
    echo "用法: $(basename $0) 月 日 年" >&2
    exit 1
fi

date --version > /dev/null 2>&1
if [ $? -ne 0 ]; then
    # 使用 ncal 作為替代方案
    dayofweek="$(ncal $1 $3 | grep "$2[^0-9]" | cut -c1-2)"
    case $dayofweek in
        Su) echo "那天是星期日" ;;
        Mo) echo "那天是星期一" ;;
        Tu) echo "那天是星期二" ;;
        We) echo "那天是星期三" ;;
        Th) echo "那天是星期四" ;;
        Fr) echo "那天是星期五" ;;
        Sa) echo "那天是星期六" ;;
    esac
else
    date -d $1/$2/$3 +"那天是 %A"
fi

#!/bin/bash
# daysago：計算指定日期距離今天的天數

if [ $# -ne 3 ]; then
    echo "用法: $(basename $0) 月 日 年" >&2
    exit 1
fi

date="$(which gdate)"
if [ $? -ne 0 ]; then
    echo "抱歉，本指令碼需要 GNU date。" >&2
    exit 1
fi

startmon=$1; startday=$2; startyear=$3
eval $($date "+thismon=%m;thisday=%d;thisyear=%Y;dayofyear=%j")

# 計算指定日期到當年年底的天數
startdatefmt="$startmon/$startday/$startyear"
daysleftinyear=$(( $(date -d "12/31/$startyear" +%j) - $(date -d $startdatefmt +%j) ))

# 計算中間年份的天數
daysbetweenyears=0
tempyear=$(( $startyear + 1 ))
while [ $tempyear -lt $thisyear ]; do
    daysbetweenyears=$(( $daysbetweenyears + $(date -d "12/31/$tempyear" +%j) ))
    tempyear=$(( $tempyear + 1 ))
done

# 當年已經過去的天數
dayofyear=$($date +%j)

# 總計天數
totaldays=$(( $daysleftinyear + $daysbetweenyears + $dayofyear ))
echo "$totaldays 天已經過去了，從 $startmon/$startday/$startyear 到今天。"

date="$(which gdate)"
function daysInMonth {
  case $1 in
    1|3|5|7|8|10|12 ) dim=31 ;;
    4|6|9|11 ) dim=30 ;;
    2 ) dim=29 ;;
    * ) dim=-1 ;;
  esac
}

function isleap {
  leapyear=$($date -d 12/31/$1 +%j | grep 366)
}

if [ $# -ne 3 ] ; then
  echo "Usage: $(basename $0) mon day year"
  exit 1
fi

$date --version > /dev/null 2>&1
if [ $? -ne 0 ] ; then
  echo "Sorry, but $(basename $0) can't run without GNU date." >&2
  exit 1
fi

eval $($date "+thismon=%m;thisday=%d;thisyear=%Y;dayofyear=%j")
endmon=$1; endday=$2; endyear=$3

daysInMonth $endmon
if [ $endday -lt 0 -o $endday -gt $dim ] ; then
  echo "Invalid: Month #$endmon only has $dim days." >&2
  exit 1
fi

if [ $endmon -eq 2 -a $endday -eq 29 ] ; then
  isleap $endyear
  if [ -z "$leapyear" ] ; then
    echo "Invalid: $endyear wasn't a leapyear; February had 28 days." >&2
    exit 1
  fi
fi

if [ $endyear -eq $thisyear ] ; then
  totaldays=$(( $($date -d "$endmon/$endday/$endyear" +%j) - $($date +%j) ))
else
  # 跨年計算邏輯
fi

echo "There are $totaldays days until the date $endmon/$endday/$endyear."

$ daysuntil 1 1 2025
There are XXX days until the date 1/1/2025.

#!/bin/bash
# bulkrename--Renames specified files by replacing text in the filename

printHelp() {
  echo "Usage: $0 -f find -r replace FILES_TO_RENAME*"
  echo -e "\t-f The text to find in the filename"
  echo -e "\t-r The replacement text for the new filename"
  exit 1
}

while getopts "f:r:" opt; do
  case "$opt" in
    r) replace="$OPTARG";;
    f) match="$OPTARG";;
    ?) printHelp;;
  esac
done

shift $(( $OPTIND - 1 ))

if [ -z "$replace" ] || [ -z "$match" ]; then
  echo "You need to supply a string to find and a string to replace"
  printHelp
fi

for i in "$@"; do
  newname=$(echo "$i" | sed "s/$match/$replace/")
  mv "$i" "$newname" && echo "Renamed file $i to $newname"
done