Tools used to optimise images within a folder/sub-folder: optipng, jpegoptim
To install these tools use the following commands:
Centos
yum install epel-release
yum update
yum install -y optipng jpegoptim
Debian/Ubuntu
apt install -y optipng jpegoptim
To use the the tools in a recursive way use the following bash script:
#!/bin/bash
################## USAGE ###########################
# ./optimiseImages.sh /full/path/to/folder OR
# ./optimiseImages.sh /full/path/to/folder > opt.log
################## END USAGE #######################
folderPathOriginal=$1
function optiomiseImages(){
folderPath=$1
for file in "$folderPath"/*
do
if [ -d "${file}" ] ; then
optiomiseImages "$file"
else
EXT="`echo ${file##*.} |tr '[a-z]' '[A-Z]'`"
if [ "$EXT" = JPG ]; then
jpegoptim -m 80 "$file"
else
if [ "$EXT" = JPEG ]; then
jpegoptim -m 80 "$file"
else
if [ "$EXT" = PNG ]; then
optipng "$file"
else
echo "FILE $file could not be optimised"
fi
fi
fi
fi
done
}
echo "---------------------FOLDER SIZE BEFORE OPTIMISE--------------"
du -h $folderPathOriginal
echo "---------------------BEGIN OPTIMISE--------------"
optiomiseImages $folderPathOriginal
echo "---------------------END OPTIMISE--------------"
echo "---------------------FOLDER SIZE AFTER OPTIMISE--------------"
du -h $folderPathOriginal
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