Completed chapter 4

docs/bibliography/bibliography.bib

@@ -737,6 +737,59 @@ AMD64 Architecture Processor Supplement},
 @online{raw_sockets,
 	title={raw(7) — Linux manual page},
 	urlhttps://man7.org/linux/man-pages/man7/raw.7.html={}
+},
+
+@online{cron,
+	title={How To Add Jobs To cron Under Linux or UNIX},
+	date={2022-06-02},
+	author={Vivek Gite},
+	url={https://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/}
+},
+
+@online{linux_daemons,
+	title={Linux Jargon Buster: What are Daemons in Linux?},
+	date={2021-06-05},
+	author={Bill Dyer},
+	url={https://itsfoss.com/linux-daemons/}
+},
+
+@online{code_kernel_getdents64,
+	indextitle={Linux kernel source code},
+	url={https://elixir.bootlin.com/linux/v5.11/source/fs/readdir.c#L351}
+},
+
+@online{getdents_man,
+	title={getdents(2) — Linux manual page},
+	url={https://man7.org/linux/man-pages/man2/getdents.2.html}
+},
+
+@online{code_kernel_linux_dirent64,
+	indextitle={Linux kernel source code},
+	url={https://elixir.bootlin.com/linux/v5.11/source/include/linux/dirent.h#L5}
+},
+
+@online{code_kerel_getdents_buffer_alignation,
+	indextitle={Linux kernel source code},
+	url={https://elixir.bootlin.com/linux/v5.11/source/fs/readdir.c#L313}
+},
+
+@online{xcellerator_getdents,
+	title={Linux Rootkits Part 6: Hiding Directories},
+	date={2020-09-19},
+	author={TheXcellerator},
+	url={https://xcellerator.github.io/posts/linux_rootkits_06/}
+},
+
+@online{embracethered_getdents,
+	title={Offensive BPF: Understanding and using bpf_probe_write_user},
+	date={2021-10-20},
+	author={Johann Rehberger},
+	url={https://embracethered.com/blog/posts/2021/offensive-bpf-libbpf-bpf_probe_write_user/}
+},
+
+@online{dtype_dirent,
+	title={Format of a Directory Entry},
+	url={https://www.gnu.org/software/libc/manual/html_node/Directory-Entries.html}
 }