for i in *.jpg* ; do mv $i `echo $i | sed 's/^.*_X450_//'` ; done
for i in *.jpg* ; do mv $i `echo $i | sed 's/^.*_Samsung_//'` ; done

for i in "*.jpg*" ; do exiftool -overwrite_original -quiet -exif:datetimeoriginal+='04:00' $i; done

for i in "p*.jpg*" ; do exiftool -overwrite_original -quiet -exif:datetimeoriginal+='2:21 12:00' $i; done
for i in "p*.jpg*" ; do exiftool -overwrite_original -quiet -exif:datetimeoriginal+='4:40' $i; done
