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Recurse directories and return random file

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# 1  
Old 07-20-2018
[SOLVED] Recurse directories and return random file
I have a nice program to change the background but I want it to operate on subdirectories as well.

Code:
# Script to randomly set Background from files in a directory
while true;do

# Directory Containing Pictures
DIR="/home/pc/Pictures"

# Internal Field Separator set to newline, so file names with
# spaces do not break our script.
IFS='
'

# Command to Select a random jpg file from directory
PIC=$(ls $DIR/*.jpg | shuf -n1)

# Command to set Background Image
gsettings set org.mate.background picture-filename $PIC

# specify how long to wait in seconds between changes
sleep 600

done

Last edited by triplemaya; 07-21-2018 at 09:22 AM.. Reason: SOLVED
# 2  
Old 07-20-2018
Try
Code:
find $DIR -iname "*.jpg"

in lieu of the ls command.
# 3  
Old 07-20-2018
Hm. To prevent find from running too often - disk intensive to list an entire big directory tree -- how about:

Code:
DIR="/home/pc/Pictures"

while true
do
        find "$DIR" -type f -name '*.jpg' | shuf | while read PIC
        do
                gsettings set org.mate.background picture-filename "$PIC"
                sleep 600
        done
done

Instead of taking the first from the randomized list then throwing the rest away, it will use the entire random-order list.
This User Gave Thanks to Corona688 For This Post:
RudiC
# 4  
Old 07-21-2018
Many thanks to you both. All working very nicely now.
This User Gave Thanks to triplemaya For This Post:
Corona688
# 5  
Old 07-25-2018
If you have ImageMagick installed you could use it to identify those images that are too small for the backgroud (eg with a width < 1200 pixels)

Code:
IR="/home/pc/Pictures"

while true
do
        find "$DIR" -type f -name '*.jpg' | shuf | while read PIC
        do
                (($(identify -format "%w" "$PIC") < 1200)) && continue
                gsettings set org.mate.background picture-filename "$PIC"
                sleep 600
        done
done

Last edited by Chubler_XL; 07-25-2018 at 12:13 AM..
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