Directory permission

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http://askubuntu.com – I am running 12.04 x64 server on ext4 disk. There are two user groups 'A' and 'B'. For a specific directory, I would like to give its all permissions to user group 'A'. Also I would like to give only 'write' permission to user group 'B'. A user of 'B' should only be allowed to write a file or create directory in the directory. (Should not be allowed to open or read a file.) I tried with acl as below but not worked well. sudo setfacl -d -m g:GROUPB:-wx /mydirectory Result: The user of GROUPB could not entered 'mydirectory' because of permission denied error. Does anyone know if it is poss (HowTos)