The following symbolic representations are being used.
u -user,
g -group
o -others
The permissions can be specified using letters r (read), w (write), x (executable).
To find any file with group write permission, use the below command
#find -perm -g=w
To get details about all options please refer the man page by the command #man find
Use the below command to find files which are writable by either their owner or their group, run:
find -perm /u+w,g+w
Use the below command to find files which are writable by both their owner and their group:
find -perm /u+w,g+w