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Is there a way to configure a Linux directory such that any time anyone in the group that owns that directory creates a file in the directory, that file will be writable by anyone in that group? I'd also like to apply this configuration to all of that directory's subdirectories.


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The link Iain provided points to the right solution.

Use setgid (Set Group ID) on the directory. Then any new files created will be "owned" by that group. You can use either of these commands;

chmod +6000 /path/to/directory
chmod g+s   /path/to/directory
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