The number 7 in the context of access permissions in Linux is the sum of read (4), write (2), and execute (1) rights. That is, 7 means full access: read + write + execute.

For example, if a file has permissions rwxr-xr-x, then the owner has 7 (rwx = 4+2+1), and the group and others have 5 (r-x = 4+0+1).

Thus, 7 is the maximum set of permissions for one of the user categories.

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