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We give the script an input directory where it looks for images. This might look confusing if youвЂ™re new to writing scripts, but what itвЂ™s doing is actually pretty simple. Img_type=$(basename `file -mime-type -b $img`)

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The following code creates a script called organize-images.sh: #!/bin/bashД®cho 'Please specify an input directory.'ДЇor img in $( find $input_dir -type f -iname '*' ) In fact, we can create a new bash to do that for us! LetвЂ™s organize them by splitting them up into different sub-directories based on their MIME type. But before we jump into optimizing all the things, we should organize our files a bit. So back anything up that you plan to use on a real project to prevent cursing yourself later. WeвЂ™re about to run programs that alter these images, and while we plan to leave the originals alone, one wrong command might change them in some irreversible way. Note: It is strongly recommended to backup your images before proceeding. OK, we have our images in the original-images directory from the GitHub repo. SVGO and svgexport are Node packages that optimize SVG assets.ImageMagick: works with all kinds of raster images.ItвЂ™s a good idea to know what weвЂ™re working with before we start using them:

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Sudo apt-get install imagemagick webp jpegoptim optipng

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Here are the commands for all of the dependencies we need to start optimizing images: sudo apt-get update Again, weвЂ™re writing Bash scripts, so weвЂ™ll be spending time in the command line. Set upД«efore we start, letвЂ™s get all of our dependencies in order. This GitHub repo has all the images weвЂ™re using and youвЂ™re welcome to grab them and follow along. The idea is to optimize images before we serve them so that users get the most visually awesome experience without all the byte bloat. In this tutorial, we will write bash scripts that create and optimize images in different image formats, targeting the most common formats, including JPG, PNG, WebP, and SVG. There are tons of ways we can make smaller and optimized images. And while they arenвЂ™t really in the same class as raster images, SVGs are another format many of us have been using in recent years because of their inherently light weight. Although these new formats are still in development and generally have limited browser support, one of them, WebP, is gaining a lot of attention. Researchers around the world are busy developing new image formats that possess high visual quality despite being smaller in size compared to other formats like PNG or JPG. And if theyвЂ™re downloading extra bytes, the site not only takes that much more time to load, but users are using more data, both of which can be resolved, at least in part, by optimizing the images before they are downloaded.

And if images are not optimized, users end up downloading extra bytes. Images take up to 50% of the total size of an average web page.

Offline png compressor