GNU/Linux Adding Write Permission to Group
This Tip is Showing You How to Give properly Read and Write Permissions Recursively to Directory and Sub-Directory to the Owner and All Users of it’s Group on GNU/Linux.
And this Setup may be very Useful to Manage Permissions on the GNU/Linux File System.

Setting Up Write Permissions on Directory
So to Setting Up Permissions Recursively
Allow Write Permission of All the Users of the Folder’s Group simply with:sudo chmod -R 770 /usr/local/rvm
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