Your linux Plaform requires the following:
ImageMagick
Inintial command line used:
convert -resize 50% -quality 80 input.jpg output.jpg
The following command can be used based on defined variables from the script available below:
for i in *.JPG; do convert -resize 800×600! -quality 75 “$i” web/”$i”; done
#!/bin/bash
# SET PICTURE’S PATH
path=/home/user/Photos/
# set variable date
NOW=$(date +”%d-%m-%y”)
# condition
if [ -d $path/$NOW ] ; then
# does exist
cd $path/$NOW
# creating the folder for lower def
mkdir web
for i in *.JPG; do convert -resize 800×600! -quality 75 “$i” web/”$i”; done
echo ‘created sub-folder called web and generated jpg’
else
# does not exist
echo ‘folder is not present’
fi