When could or should I use chmod g+s on a file or directory?

Question

In deploying to a new (Solaris 9) environment recently, one of the steps was to copy a set of files and directories to their new location and then to apply the group UID bit (us

Answer 1

When you need to use it: Fix SVN file ownership issue when you use svn+ssh. Somebody told me it only happens on BDB, but I had such issue in FSFS storage too. Basically when you want to keep the ownership of child files inside a directory consistent when there are other users writing stuff on it, you would have to use u+s/g+s.