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Filesystem permissions

We used to work with the read/write/access permissions. These are not adapted to what we want. That is why we use new ones. These apply also to directories, which are some kind of files.

Basically, four kinds of accesses can be granted or denied to a file :

The association of the three former can be associated with the more used following permissions :

-- No access granted
R- Read-only
-A- Append-only (can't read)
RA- Read and append-only (often called append-only)
-T Truncate only
R-T Read and Truncate only
-AT Write-only
RAT Read/Write

Biondi Philippe 2000-12-15