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== OSX ==

Add user into a group
# dscl . merge /groups/procmod users pedro


Create a ramdisk:
$ hdid -nomount ram://52428800
$ newfs_hfs /dev/disk1
$ mkdir /tmp/ramdisk1
$ mount -t hfs /dev/disk1 /tmp/ramdisk1

to ditch the RAM disk and unmount it, just type
$ hdiutil detach /dev/disk1