perl -p -i -e “s/<old str>/<new str>/g” <file /path/name>
??
perl -p -i.bak -e "next if /^sandwich,hamburger,/" comma.file ?? perl -n -i.bak -e "print unless /^sandwich,hamburger,/" comma.file

peshka's reminder site – ver. 2.0
perl -p -i -e “s/<old str>/<new str>/g” <file /path/name>
??
perl -p -i.bak -e "next if /^sandwich,hamburger,/" comma.file ?? perl -n -i.bak -e "print unless /^sandwich,hamburger,/" comma.file