find: Changing Special Permissions
5.2.3 Changing Special Permissions
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In addition to changing a file's read, write, and execute permissions,
you can change its special permissions. ⇒Mode Structure, for a
summary of these permissions.
To change a file's permission to set the user ID on execution, use
'u' in the USERS part of the symbolic mode and 's' in the PERMISSIONS
part.
To change a file's permission to set the group ID on execution, use
'g' in the USERS part of the symbolic mode and 's' in the PERMISSIONS
part.
To change a file's permission to set the restricted deletion flag or
sticky bit, omit the USERS part of the symbolic mode (or use 'a') and
put 't' in the PERMISSIONS part.
For example, to add set-user-ID permission to a program, you can use
the mode:
u+s
To remove both set-user-ID and set-group-ID permission from it, you
can use the mode:
ug-s
To set the restricted deletion flag or sticky bit, you can use the
mode:
+t
The combination 'o+s' has no effect. On GNU systems the combinations
'u+t' and 'g+t' have no effect, and 'o+t' acts like plain '+t'.
The '=' operator is not very useful with special permissions; for
example, the mode:
o=t
does set the restricted deletion flag or sticky bit, but it also removes
all read, write, and execute permissions that users not in the file's
group might have had for it.
Info Catalog
find: Copying Permissions
find: Symbolic Modes
find: Conditional Executability