Tag Name cache_effective_group
Usage cache_effective_group groupid

Description
If the cache is run as root, it will change its effective/real GID to the GID specified below. The default is to change the GID to nogroup. If Squid is not started as root, the default is to keep the current GID. Note that if Squid is not started as root then you cannot set http_port to a value lower than 1024.

If the squid started with the groupid squid then the cache_effective_group will be given as squid. If it is started as root, then the default value will be taken. For further info on the above two tags, see Effective user and group

Default cache_effective_group nogroup

Example
cache_effective_group squid

Caution
If it is not configured properly, then squid may run in to problem.