Does Cygwin or POSIX have a tool to test whether a file is owned by a specific group? Win32, like Linux and POSIX, has the concept that files have an owner, and a group (ref:https://learn.microsoft.com/en-us/windows/win32/api/aclapi/nf-aclapi-getsecurityinfo). How can I test whether a file is owned by a given group name, or not? /usr/bin/test -g and -G do not help because they only look and gid, egid. But I want to pass the group's name as an argument. Sebi -- Sebastian Feld - IT security consultant