Il modello di sicurezza di Unix/Linux

• Understand basic Unix file permissions - Chad Perrin

  https://www.techrepublic.com/blog/it-security/understand-basic-unix-file-permissions/

• managing default Unix file permissions with adduser and umask - Chad Perrin

  https://www.techrepublic.com/blog/it-security/managing-default-unix-file-permissions-with-adduser-and-umask/

• Understand the setuid and setgid permissions to improve security - Chad Perrin

  https://www.techrepublic.com/blog/it-security/understand-the-setuid-and-setgid-permissions-to-improve-security/

• Come gestire utenti e permessi su Linux Ubuntu

  https://www.cloud.it/tutorial/come-gestire-utenti-e-permessi-su-ubuntu.aspx

• Problems in the Design of Unix https://homepage.cs.uri.edu/~thenry/resources/unix_art/ch20s03.html