anchor.diff:  [source,shell]
   ----
   f_pre
  +f_kernel
   f_firewall
   f_disablenet
   f_disablefs
  
positive.code: f_aide_timer
  f_aptget_noexec
  f_systemddelta
  f_checkreboot
  ----
  
  
negative.code: │   ├── 39_motdnews.bats
  │   ├── 40_usbguard.bats
  │   ├── 41_compilers.bats
  │   ├── 42_kernel.bats
  │   ├── 99_misc.bats
  │   ├── runHostTests.sh
  │   └── test_helper.bash
  ├── ubuntu.cfg
  └── ubuntu.sh
  
  6 directories, 119 files
  ----
  
  == Recommended reading
  https://www.cisecurity.org/benchmark/distribution_independent_linux/[CIS Distribution Independent Linux Benchmark] +
  https://public.cyber.mil/stigs/downloads/?_dl_facet_stigs=operating-systems%2Cunix-linux[Canonical Ubuntu 16.04 LTS STIG - Ver 1, Rel 2] +
  https://public.cyber.mil/stigs/downloads/?_dl_facet_stigs=operating-systems%2Cunix-linux[Red Hat Enterprise Linux 7 - Ver 2, Rel 3 STIG ] +
  https://www.cisecurity.org/benchmark/ubuntu_linux/[CIS Ubuntu Linux Benchmark] +
  https://wiki.ubuntu.com/Security/Features +
  https://help.ubuntu.com/community/StricterDefaults +
  https://www.ncsc.gov.uk/collection/end-user-device-security/platform-specific-guidance/ubuntu-18-04-lts[EUD Security Guidance: Ubuntu 18.04 LTS]
  