added comments in unattended script

unattended.sh

@@ -1,25 +1,34 @@
 #!/usr/bin/env bash
 
+# Get the file name
 ISONAME=$(ls | grep "netinst.iso" | sort | tail -n1)
+# Remove an already existing unattended iso of this same version, if existing
 rm -f $(echo ${ISONAME} | sed 's/netinst/unattended/')
+# Extract iso files
 xorriso -osirrox on -indev ${ISONAME} -extract / isofiles
+# Remove the grub menu
 sudo sed -i '/vesamenu.c32/d' isofiles/isolinux/isolinux.cfg
+# Fix the grub menu
 if [[ $(grep timeout_style isofiles/boot/grub/grub.cfg) == "" ]]; then
   sudo sed -i 's/insmod play/set timeout_style=hidden\nset timeout=0\nset default=1\n\ninsmod play/' isofiles/boot/grub/grub.cfg;
 fi
 
+# Extract the initrd image, put the preseed file in int, and re-compress
 chmod +w -R isofiles/install.amd/
 gunzip isofiles/install.amd/initrd.gz
 echo preseed.cfg | cpio -H newc -o -A -F isofiles/install.amd/initrd
 gzip isofiles/install.amd/initrd
 chmod -w -R isofiles/install.amd/
 
+# Recreate the md5sum check file
 cd isofiles/
 chmod a+w md5sum.txt
 md5sum $(find -follow -type f) > md5sum.txt
 chmod a-w md5sum.txt
 cd ..
 
+# Repackage all the iso files
 chmod a+w isofiles/isolinux/isolinux.bin
 docker run --interactive --tty --rm --volume $(pwd):/root/unattended debian:buster /root/unattended/docker.sh
+# Remove the extracted (temporary) files
 sudo rm -rf isofiles