How to edit 'etc/hosts' file?

I'm using Nexus 5 on Android 4.4. Kitkat. I would like to edit /etc/hosts file and add redirect mappings in order to block few ads. I need to know how to access/modify/replace /etc/hosts file. --- I have already checked below similar Q/A: - https://android.stackexchange.com/questions/1957/how-to-change-the-hosts-file-to-redirect-urls -> Link in the answer is broken - https://android.stackexchange.com/questions/16847/guide-to-editing-etc-hosts -> Not found a way to edit hosts file.