chmod


mode
4 number
(set uid)(owner)(groupowner)(others)

backdoor 로 얘내 변경하는거
set uid
- read 4
- write 2
- execute 1


- x
- r
- w


> [[UNIX / Linux] 권한 관리(chmod, chown, chgrp, umask)](https://eunguru.tistory.com/93)




