I followed an instruction to prepare LPIC and encounter such a find instruction

$ sudo find / -perm +6000 -type f
[sudo] password for Christine:

but when I tried ,

me@host:~$ sudo find / -perm +6000 -type f
find: invalid mode ‘+6000’

the book is 2015 version LPIC-1: Linux Professional Institute Certification Study Guide: Christine

How could I enable +6000 working on Ubuntu 18.10

1 Answer 1


According to man pages of find perm +mode is deprecated

-perm +mode
              This is no longer supported (and has been deprecated since 2005).  Use -perm /mode instead.

You can try:-

find / -perm /6000 -type f

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