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 1. remote root .
 2. shadow .
 3. root .
 (root) . root idle time w root .().
 4. root .
 5. .
 6. .rhosts /etc/hosts.equiv /dev/null .
 $ln -s /dev/null /.rhosts
 $ln -s /dev/null /etc/hosts.equiv
 7. root PATH ..
 . root PATH .(.) root .. /user1/sspark ls .
 #!/bin/sh
 /bin/rm -rf /
 root () ls . root PATH ...
 8. CGI .
 9. CGI 711 .
 10. .
 11. CGI .()
 12. root .
 13. CGIWrapper .
 14. TCP_Wrapper .
 15. chroot .
 16. ..().........
 17. (, messages, maillog, secure) , cron
 
 
 
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