rotate

#!/bin/sh

if [ -z "$1" ]; then
  echo "Usage: $0 [ <degrees> ] <images> ... [ <degrees> <images> ... ] ..."
  exit 1
fi

angle=90

for arg in "$@"; do
  if [ "$arg" = 90 ] || [ "$arg" = 180 ] || [ "$arg" = 270 ]; then
    angle="$arg"
    shift
  else
    file="$arg"
    shift
    newfile="${file}.$angle.$$"
    jpegtran -rotate $angle -copy all "$file" > "$newfile"
    [ -s "$newfile" ] && mv "$newfile" "$file"
  fi
done