Bash script to optimize your images and convert them in WebP

Prerequisite

• jpegoptim
• optipng
• WebP

Debian/Ubuntu :

sudo apt install jpegoptim optipng webp -y

Centos 7 :

sudo yum install optipng jpegoptim libwebp-tools -y

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Installation

1. Download the script

git clone https://github.com/VirtuBox/img-optimize.git $HOME/.img-optimize

2. Add an alias in your bashrc

echo "alias img-optimize=$HOME/.img-optimize/optimize.sh" >> $HOME/.bashrc
source $HOME/.bashrc

Usage

Usage: img-optimize [options] <images path>
If images path is not defined, img-optimize will use the current directory
  Options:
       --jpg <images path> ..... optimize all jpg images
       --png <images path> ..... optimize all png images
       --webp <images path> ..... convert all images in webp
       --nowebp <images path> ..... optimize all png & jpg images
       --all <images path> ..... optimize all images (png + jpg + webp)
 Other options :
       -h, --help, help ... displays this help information
Examples:
  optimize all jpg images in /var/www/images
    img-optimize --jpg /var/www/images

Update the script

To update the script, just run :

git -C $HOME/.img-optimize pull

source .bashrc

Setup daily cronjob

You copy the scripts to /etc/cron.daily :

cp $HOME/.img-optimize/crons/jpg-png-cron.sh /etc/cron.daily/jpg-png-cron
cp $HOME/.img-optimize/crons/jpg-png-cron.sh /etc/cron.daily/webp-cron

chmod +x /etc/cron.daily/jpg-png-cron
chmod +x /etc/cron.daily/webp-cron

Then just edit your websites path set with the variables sites at the beginning of the cron scripts.

Warning

Conversion process can take a while, you can use tmux to launch the script and be able to close your ssh connection without interrupting conversion. Then just use tmux attach to login back in your tmux session.

Credits

WebP conversion script was inspired by this DigitalOcean Community Tutorial