Linux Luminarium - 1 The Command Line — Transcript

Full transcript

1. 0:00hello hackers I'm Yan welcome to Bone
2. 0:03College in this video we're talking
3. 0:05about the Linux command line all right
4. 0:07you've probably seen the Linux command
5. 0:10line at some point in your life
6. 0:12hopefully and maybe it was just now and
7. 0:14you're saying what the heck is going on
8. 0:16uh it looks something like this there's
9. 0:18some sort of a prompt in this case it is
10. 0:21that uh hashtag there and afterwards
11. 0:24there is some words typed out it says
12. 0:28Echo hello hacker and the next line says
13. 0:31hello hackers and all this shows up in a
14. 0:34terminal on the command line why what
15. 0:37happened what's going on here let's dig
16. 0:40in all right the command line we
17. 0:44sometimes call it the shell uh the
18. 0:48command shell I don't I should know why
19. 0:51we call the command shell you know what
20. 0:53I'm going to pause and we're going to
21. 0:54Google and I'll be right back okay we
22. 0:57are back um there's not a good reason
23. 1:00it's a it's a silly reason we're just
24. 1:01going to move on all right so the shell
25. 1:05the command shell is what you type
26. 1:07commands into and it carries them out
27. 1:10for you and that's what happens
28. 1:13typically this
29. 1:14command has the name of the command of
30. 1:18the program of the operation you want
31. 1:21done and a couple of parameters to that
32. 1:24command and on the command line they're
33. 1:26separated by spaces so up here where we
34. 1:30did Echo space hello space hackers we
35. 1:33ran the echo command with hello and
36. 1:35hackers as the parameters awesome all
37. 1:41right typically the parameter to a
38. 1:44command is also called an argument
39. 1:47that's a synonym uh again silly
40. 1:50historical reasons parameters arguments
41. 1:53if you type cat space flag what happened
42. 1:56here we invoke the cat program with a
43. 1:59parameter of a flag and the cat program
44. 2:04which in Linux reads a file and outputs
45. 2:07it to the terminal or to other places as
46. 2:10you'll find out throughout um this
47. 2:12module or throughout this this Linux uh
48. 2:16uh material that we
49. 2:18have um it will read that flag file the
50. 2:23file called flag and it will output it
51. 2:25all right awesome in this case the file
52. 2:29that was called flag
53. 2:30had the contents pawnor col and then in
54. 2:33Curly's 1337 and that's what got printed
55. 2:36that's how you print out a file uh on
56. 2:39command line in Linux all right awesome
57. 2:43so what are these parameters arguments
58. 2:46etc etc uh they can vary quite a lot
59. 2:51right with cat it's simple you provide
60. 2:53the file it shows it to you Echo you
61. 2:56provide text it shows you that text not
62. 2:59the files not the the contents of the
63. 3:01file with that name but the text itself
64. 3:03if I did Echo space flag it would just
65. 3:05say flag
66. 3:08cool um some arguments to
67. 3:12commands make the command act
68. 3:14differently for example with Echo you
69. 3:17saw I did Echo hello hackers and it
70. 3:20output a new the the hello hackers on
71. 3:23its own line and then on the next line
72. 3:24the next prompt if I pass the dash and
73. 3:27command to Echo it won't output that it
74. 3:30won't end the line and the prompt just
75. 3:32continues the same line that's annoying
76. 3:34uh in this case in other cases more
77. 3:36advanced usages that you will encounter
78. 3:39throughout your journey in Pawn College
79. 3:42that's useful awesome all
80. 3:45right now uh there is
81. 3:50a kind of uh a convention that for
82. 3:55arguments that change the functionality
83. 3:56of commands if there there's a single
84. 3:58Dash with a single letter DN means no
85. 4:03new line right now for longer arguments
86. 4:08that don't fit in a single letter such
87. 4:10as D- UTC to make the date command
88. 4:12output the current date in UTC format
89. 4:16that is uh uh universal
90. 4:20time what the what do do you stand
91. 4:22for
92. 4:26UTC okay one sec I'll Google
93. 4:30again coordinated universal time UTC
94. 4:33stands for coordinated universal time of
95. 4:35course it does all right I knew that we
96. 4:37knew that you knew that we'll pretend
97. 4:39that didn't happen um date-- UTC will
98. 4:43output the date in UTC format
99. 4:48awesome
100. 4:50commands and your knowledge of the
101. 4:52commands is what allows you to use the
102. 4:55Linux command line effectively and
103. 4:57throughout this module you will learn to
104. 4:59use it more and more and more
105. 5:00effectively throughout this this entire
106. 5:03Linux material um and uh will become a
107. 5:07intermediate user if you aren't already
108. 5:10you'll take then take that knowledge and
109. 5:12push through the rest of PA college to
110. 5:15be an excellent hacker all right
111. 5:19so go forth tackle the Linux luminarium
112. 5:25learn the command line and keep in mind
113. 5:28that
114. 5:30everything you're using here the
115. 5:31conventions the technology the command
116. 5:34line itself it's not some you know
117. 5:39immaculately designed thing it's it's
118. 5:41something that evolved something that
119. 5:43that that that uh was created for
120. 5:46specific purposes that made sense at the
121. 5:48time and then evolved past that and then
122. 5:50changed and modified and combined and
123. 5:53people argued about its design about
124. 5:55little minutia and various egos went out
125. 5:58here and there and decisions were made
126. 5:59and so on it is an
127. 6:02organically uh evolved system with a lot
128. 6:06of quirks as a result so sometimes you
129. 6:10know why is there a dash dash for long
130. 6:13arguments
131. 6:15why that's just how it
132. 6:17is one of the people that made all of
133. 6:21this occur all of this happen all of
134. 6:23this uh continue to be used and popular
135. 6:25is the creator of Linux Linux tals um
136. 6:29throughout
137. 6:30the the the platform you try to Splash
138. 6:32in a little bit of History here and
139. 6:33there some fun stuff Linux tals created
140. 6:37Linux back in 1991 or
141. 6:411992 um and
142. 6:44uh started out as a hobby project there
143. 6:47was actually a much bigger more serious
144. 6:50operating system called multic that was
145. 6:52the first uh in that project is where I
146. 6:57just learned the name the shell was
147. 7:00coined um and Linux wrote kind of a
148. 7:03Linus wrote a hobbiest version of it
149. 7:05called Linux that hobest version took
150. 7:07over the world it's running on uh a big
151. 7:11chunk of the cell phones out there
152. 7:12almost all the wireless routers etc etc
153. 7:15etc and on desktops servers and stuff
154. 7:19around the world including the pone
155. 7:21caller server which is why you are
156. 7:23working with
157. 7:25Linux so hope this is a good
158. 7:28introduction
159. 7:30dig on and we'll see you in future
160. 7:33videos