[Help Wanted] Filtering comments out of hostfiles in Linux

Hi,

I’m using a hostfile from this project on my local dns server to block ads. However I have some problems in my script with inline comments:

# copy dns to all_domains (tempfile)
cat StevenBlack-hosts | grep '^0.0.0.0' | egrep -v '^$|#|127.0.0.1|255.255.255.255|::1' | cut -d " " -f 2 >> $all_domains
# include local blacklist and hostfiles from other sources
cat $manuell_blacklist >> $all_domains

# remove comments and empty lines
cat $all_domains | egrep -v '^$|#' | sort | uniq  > $all_domains_uniq
# dns entries should be resolved with zone containing 0.0.0.0
cat $all_domains_uniq | sed -r 's/(.*)/zone "\1" {type master; file "\/etc\/bind\/db.blocked";};/' > $zonefile

This will remove entries like foo.bar # This may interefere with example.com

[StevenBlack]

Hey @mueller-ma this is great!

[mueller-ma]

https://github.com/StevenBlack/hosts/wiki/Bind-DNS-Server https://github.com/mueller-ma/block-ads-via-dns