How to manage local and staging domains cleanly using hosts file profiles

Developers frequently end up with cluttered /etc/hosts files containing conflicting entries for the same hostname across local, staging, and cutover environments. A practical solution involves maintaining separate hosts profile files in a dedicated directory and activating only one at a time by copying it over the system hosts file. A simple shell script can automate this process, backing up the existing hosts file with a timestamp and flushing the DNS cache after each switch. For setups requiring shared base entries alongside project-specific overrides, profiles can be concatenated using cat and tee before applying. This approach is recommended until more complex tooling like dnsmasq or CoreDNS becomes necessary for wildcard domains or team-wide dynamic DNS needs.