LINUX isn't Hard Once You Understand This (File Directories) — Transcript

Full transcript

1. 0:00Have you ever opened a Linux terminal
2. 0:01and wondered, "Why is everything inside
3. 0:03a single slash? Where is the C drive?
4. 0:06Why are there folders called /bin, /etc,
5. 0:09/usr, and /var? And why does Linux seem
6. 0:13so different from Windows?" If you've
7. 0:15ever been confused by the Linux file
8. 0:17system, don't worry. In the next few
9. 0:19minutes, you'll understand how Linux
10. 0:20organizes everything, what each major
11. 0:22directory is used for, and how to
12. 0:24remember them forever. Let's start from
13. 0:26the very top. Unlike Windows, Linux
14. 0:29doesn't have separate drives like C, D,
15. 0:31or E. Instead, Linux has a single
16. 0:34starting point called the root
17. 0:36directory. It's represented by just one
18. 0:38character, slash. Think of it as the
19. 0:41trunk of a tree. Every file, every
20. 0:43folder, every application, every hard
21. 0:46drive, and even USB devices eventually
22. 0:48become part of this one tree. No matter
23. 0:51where something is stored, everything
24. 0:53starts from the root. That's one of the
25. 0:55biggest differences between Windows and
26. 0:57Linux. Now, let's walk through the most
27. 0:59important folders. We'll start with one
28. 1:01you'll use almost every day, /home.
29. 1:04This is where user files are stored. If
30. 1:07your username is John, your personal
31. 1:09folder will usually be /home/john.
32. 1:13This is where you'll keep your
33. 1:14documents, downloads, pictures, videos,
34. 1:17projects, and everything related to your
35. 1:19account. Think of it like your personal
36. 1:21workspace. Every user gets their own
37. 1:24home directory, keeping files separate
38. 1:26from other users on the system. Next is
39. 1:29the root user's home directory, which
40. 1:31often confuses beginners. There's a
41. 1:33folder called /root.
42. 1:36This is not the root of the file system.
43. 1:38It's simply the home directory of the
44. 1:39administrator account, known as the root
45. 1:42user. So, remember, slash is the root of
46. 1:45the entire file system. /root is just
47. 1:48one folder inside it. Now, let's look at
48. 1:50where Linux keeps its programs. You'll
49. 1:53often hear about /bin. The word bin
50. 1:56stands for binaries. This folder
51. 1:58contains essential command line programs
52. 2:01that Linux needs to function. Commands
53. 2:03like ls, cp, mv, cat, mkdir, and many
54. 2:08others live here or in related binary
55. 2:10directories. Think of /bin as the
56. 2:13toolbox that allows Linux to operate.
57. 2:15Without these commands, the system
58. 2:17wouldn't be very useful. Another
59. 2:19important directory is /sbin.
60. 2:22The S stands for system. This folder
61. 2:25contains administrative tools used for
62. 2:27managing the operating system. Commands
63. 2:30for networking, disk management, booting
64. 2:32the system, and system recovery are
65. 2:34commonly found here. Most regular users
66. 2:36don't use these commands every day, but
67. 2:38system administrators certainly do. Now,
68. 2:41let's talk about one of the most
69. 2:42important folders in Linux, /etc.
70. 2:46This is where Linux stores configuration
71. 2:48files. Almost every application has a
72. 2:50configuration file somewhere inside
73. 2:52/etc.
74. 2:54Want to change network settings? Edit a
75. 2:56configuration in /etc.
76. 2:59Need to configure SSH? It's inside /etc.
77. 3:03DNS settings? Also inside /etc.
78. 3:07Instead of storing configuration inside
79. 3:09the application itself, Linux keeps most
80. 3:11settings here.
81. 3:12A simple way to remember it is /etc
82. 3:16is the settings folder for your entire
83. 3:17operating system.
84. 3:19Next is a directory beginners often
85. 3:21misunderstand, /usr.
86. 3:24Many people assume it stands for user.
87. 3:26It actually comes from Unix system
88. 3:28resources. This folder contains most of
89. 3:31the software installed on your system.
90. 3:33Applications, libraries, documentation,
91. 3:36development tools, and shared resources
92. 3:39all live here. For example, /usr/bin
93. 3:44contains thousands of executable
94. 3:45programs.
95. 3:46Think of /usr as the main software
96. 3:49library of of Linux machine.
97. 3:51Applications also need shared code.
98. 3:53That's where {slash}lib comes in.
99. 3:56Libraries are reusable pieces of code
100. 3:58that many applications share.
101. 4:00Instead of every program including the
102. 4:02same code repeatedly, Linux stores
103. 4:04common functionality in shared
104. 4:06libraries.
105. 4:07This saves disk space and makes updates
106. 4:09much easier.
107. 4:10You can think of libraries as shared
108. 4:12building blocks that applications borrow
109. 4:14whenever they need them.
110. 4:16Now, let's look at where Linux stores
111. 4:17temporary files. {slash}tmp.
112. 4:20As the name suggests, this directory is
113. 4:22used for temporary data. Applications
114. 4:25create files here while they're running.
115. 4:27Many Linux systems automatically clean
116. 4:29this directory during reboot. So, don't
117. 4:31store anything important inside
118. 4:33{slash}tmp unless you're okay with
119. 4:35losing it. Another useful folder is
120. 4:37{slash}var.
121. 4:39The word var stands for variable. Unlike
122. 4:42application software, which rarely
123. 4:44changes, this folder contains files that
124. 4:46constantly grow and change. Things like
125. 4:48system logs, application logs, email
126. 4:51queues, databases, printer queues, and
127. 4:54cache files.
128. 4:55Whenever you're troubleshooting Linux,
129. 4:57{slash}var{slash}log
130. 4:59is one of the first places you'll check
131. 5:01because it contains log files that
132. 5:03explain what the system has been doing.
133. 5:05>> Now, suppose you plug in a USB drive.
134. 5:08Where does it appear? Usually inside
135. 5:10directories like {slash}media or
136. 5:12{slash}mnt.
137. 5:13The {slash}media directory is commonly
138. 5:15used for automatically mounted devices
139. 5:18such as USB drives and DVDs. The
140. 5:21{slash}mnt directory is often used by
141. 5:23administrators when manually mounting
142. 5:25disks, network shares, or other storage
143. 5:27devices. This is another major
144. 5:30difference from Windows. Instead of
145. 5:32assigning a drive letter, Linux simply
146. 5:34attaches the new storage somewhere
147. 5:36within the existing directory tree.
148. 5:39You'll also come across {slash}dev.
149. 5:41This one is fascinating. In Linux,
150. 5:44almost everything is treated as a file.
151. 5:46Hard drives, USB devices, keyboards,
152. 5:49mice, printers, even terminals, they all
153. 5:53appear as files inside {slash} dev. For
154. 5:56example, your hard disk might appear as
155. 5:58{slash} dev {slash} sda. This design
156. 6:02allows programs to interact with
157. 6:04hardware using the same file-based
158. 6:06interface they use for regular files.
159. 6:08It's one of the reasons Linux is so
160. 6:10flexible. Another important folder is
161. 6:13{slash} proc. Unlike normal directories,
162. 6:16{slash} proc doesn't actually exist on
163. 6:19your hard disk. It's a virtual file
164. 6:21system created by the Linux kernel. It
165. 6:23contains live information about running
166. 6:25processes, CPU usage, memory, system
167. 6:29configuration, and much more. Whenever
168. 6:32monitoring tools need information about
169. 6:34your system, they often read it from
170. 6:35{slash} proc. Think of it as a live
171. 6:38dashboard of what's happening inside
172. 6:40Linux right now. There's also {slash}
173. 6:42boot. As the name suggests, this folder
174. 6:45contains everything needed to start
175. 6:47Linux. The Linux kernel, boot loader
176. 6:50files, and startup configuration all
177. 6:52live here. Without these files, your
178. 6:55operating system wouldn't be able to
179. 6:56boot. So, how do you remember all of
180. 6:58these? Instead of memorizing random
181. 7:00folder names, group them by purpose.
182. 7:03User files live in {slash} home.
183. 7:06Programs live in {slash} bin, {slash}
184. 7:08sbin, and {slash} usr. Configuration
185. 7:12files live in {slash} etc. Shared
186. 7:14libraries live in {slash} lib. Logs and
187. 7:17changing data live in {slash} var.
188. 7:20Temporary files live in {slash} tmp.
189. 7:22Hardware devices appear inside {slash}
190. 7:24dev. System information comes from
191. 7:27{slash} proc. Boot files live in {slash}
192. 7:29boot. External storage is mounted under
193. 7:32{slash} media or {slash} mnt.
194. 7:36Once you understand this structure,
195. 7:37navigating Linux becomes far less
196. 7:39intimidating, and you'll know exactly
197. 7:41where to look when installing software,
198. 7:43changing configurations, troubleshooting
199. 7:46problems, or managing servers.