Lets assume we have two web developers working on the same web project and they will need a single shared location to store and collaborate their development work with each other. In bellow example I have taken “/var/web-dev” as the shared location and it’s owned by Apache user (www-data). Two developers, danny and penny, needs to store their development work in “/var/web-dev”.

Assuming we already has logins for danny and penny, we have to add them to Apache user group.

usermod -aG www-data danny
usermod -aG www-data penny

Then set the execution bit and write permission for group for /var/web-dev.

chmod -R g+w /var/web-dev/
chmod -R g+s /var/web-dev/

Make sure they have their umask set as at least 002 (system default is 022). This will make any new files created read/write to group. To apply umask setting automatically at login, you would add the umask command to your .login file (C Shell users) or .profile (Bourne and Korn Shell users).