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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 permission to read data (R)
- the permission to append data (A)
- the permission to truncate the file (T)
- the permission to execute the file (X)
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