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RixmodeKeep 'em out.
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Unix represents file modes as six octal numbers where the top or leftmost three digits denote the file type (directory, regular file, socket, et al) and the lower or rightmost three digits denote access rights.
The 'user' or owner, the user's 'group', and everyone else ('other') are given a combination of read, write, and execute access rights on every file. As these are octal, and as read is 4, write is 2, and execute is 1, full rights for anyone is a 7.
Thus a 'mask' of 777 lets anyone do anything and a 'mask' of 700 limits access to you.
Normally file modes are allotted rationally and new folders are given functional file modes, but with an increasing sensitivity to outside threats the need to lock a machine and lock out intruders becomes crucial.
Anyone who gains access to your computer, either illicitly or by tacit sharing, whether virtually or physically, can access your files if file modes are not properly set.
Rixmode is used to set the file mode for any file system item or group of items, in batch through drag and drop or by recursion. Rixmode is an important tool in securing your computer against the intrusion that must never be allowed to happen.
Using Rixmode's 'Mask' function it's possible to clamp down your entire home directory in seconds: everyone but you gets shut out. Completely and permanently.
That's the Unix solution - it's a lot safer than FileVault.