Linux permissions
- create a group
sudo groupadd mygroup
- add yourself (and others)
sudo usermod -a -G mygroup myuser
- set up a folder for sharing - you want g+w and g+s
mkdir myshare && chmod g+ws myshare
If you need to share an existing folder, you need to do g+w and also retroactively update g+s on all the directories manually with this stupid hack (becuase -R doesn't work, stupid linux bullshit):
sudo chmod -R g+w myshare
find myshare -type d -exec chmod g+s '{}' \;
Restricting a user to a specific folder
I have found that for several folders on my server I do not have the w+x bit set for folders:
drwxrwxr-- 12 m m 4.0K Feb 3 2017 .
This was killing me, as I tried to set user-specific permissions on symlinks to subfolders deep within the top level folder. They would fail because the user could not cd to the folder due to the missing +x. You have to make sure the WHOLE F'IN FOLDER CHAIN HAS g+x ON IT in order for a specific user to be able to cd to it.