How to set read only access to one more group
We are aware that unix has three sets of permission such as owner, group and others.
I have a requirement to have a read-only access to a folder and sub-folders and the group that currently holds can't be used. Because it has write privileges. I would rather not prefer to use others, because it opens to each user in the system.
Can someone suggest some ideas to have read-only access for another group? Thanks in advance for your time.