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Bash with problems related to files

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# 1  
Wrench Bash with problems related to files

Hi unix people, i'm really a newbie and i've created a small bash to process some picture with ImageMagick.
I have just some issue and i think this script, if we can help me to correct in right way, could be useful!

Basically i have a Eyefi Card who puts files into a folder called "picture"
(sorry i must use cygwin cause last version EyeFi does'nt work under linux environemet)
i need take only the last 25 pictures from that,rename and put in a separate folder (i don't know how to do it so i put on same Smilie )
after i process the dimension, add the watermark and copy on different folder.

here the code:
while : 
    echo "Foto Su Eyefi build 1.9 del 28.07.2015 ---- Riccardo Galardi"
    sleep 2s
    sleep 2s
	cd /
    cd cygdrive/c/PICTURES	
	echo "--------OK---------"
    echo "Prendo gli ultimi 25 files e li sovrascrive nella stessa cartella PICTURES con numerazione progressiva"
    sleep 2s
	find $DIR -type f -printf "%T@ %p\n" | sort -n | cut -d' ' -f 2 | tail -n 25 | gawk 'BEGIN{ a=1 }{ printf "mv \"%s\" %04d.JPG\n", $0, a++ }' | bash
    echo "--------OK---------"
	sleep 2s
	echo "Riduco le dimensioni a 1920 lato lungo"
    mogrify -resize 1920x1920 *.jpg
	sleep 2s
	echo "--------OK---------"
	echo "Inserisci il Logo sulle foto"
	mogrify *.jpg -gravity center -draw "image over 0,0 0,0 'Back.png'" *.jpg
	echo "--------OK---------"
	sleep 2s
    echo "Copia le foto elaborate sul drive Z"
    cp *.JPG /cygdrive/z
	echo "--------OK---------"
	sleep 2s
    echo "attendo 10 sec"
	echo "Press [CTRL+C] to stop.."
    sleep 10s

my biggest problem is: how i can exctract only the pictures and not the other files inside the folder? (often my watermark is taked as picture...and processed also if it's in a separate folder)
and how can i put only the last 25 files on a separate folder?

Thank you very much, really apreciate any help.... and hope my script could be interesting to someone else who use EyeFi card
# 2  
If you expect different image file types within the Pictures folder, and the watermark - i assume it is 'back.png') - in the same location, you will run into issues.
I'd rather suggest to put the watermark file outside the working path, and refer to it via a variable.

Another issue is, at one time your refer to *.jpg another time to *.JPG
To limit the find output, you must define a filter like -name *.jpg


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