comment bash script

install-optipng.sh

@@ -1,14 +1,21 @@
 #!/bin/bash
 
+# install prerequisites
 sudo apt-get install build-essential libpng-dev -y
 
+# go into /usr/local/src and remove previous optipng folder/archive
 cd /usr/local/src
 rm -rf optipng*
 
+# get the latest optipng release link
 OPTIPNGLATEST=$(wget http://optipng.sourceforge.net/ -O - | grep tar.gz | awk -F "[\"]" '{print $4}')
+
+# download and extract optipng
 wget $OPTIPNGLATEST -O optipng.tar.gz
 tar -xf optipng.tar.gz
 cd optipng-*
+
+# configure and compile optipng
 ./configure --prefix=/usr
 make -j "$(nproc)"
 sudo make install

install-webp.sh

@@ -1,13 +1,18 @@
 #!/bin/bash
 
+# install prerequisites
 sudo apt-get install build-essential libjpeg-dev libpng-dev libtiff-dev libgif-dev libwebp-dev -y
 
+# go into /usr/local/src and remove previous libwebp folder/archive
 cd /usr/local/src || exit
 rm -rf libwebp*
 
+# download and extract latest libwebp sources
 wget https://storage.googleapis.com/downloads.webmproject.org/releases/webp/libwebp-1.0.0.tar.gz -O libwebp.tar.gz
 tar xvzf libwebp.tar.gz
 cd libwebp-* || exit
+
+# configure libwebp and launch compilation
 ./configure
 make -j "$(nproc)"
 sudo make install