1 00:00:00,540 --> 00:00:02,810 Hello and welcome to this lecture. 2 00:00:02,880 --> 00:00:11,660 In this lecture hall be walking you through how to interact with Ruby using single command. 3 00:00:12,180 --> 00:00:19,140 We are going to be using the command line utility if you are using a Mac. 4 00:00:19,170 --> 00:00:20,640 This will be your terminal. 5 00:00:20,640 --> 00:00:25,530 So if you could open up your terminology on the windows This would be your common prompt. 6 00:00:25,530 --> 00:00:28,050 So I am using a Windows based computer. 7 00:00:28,050 --> 00:00:33,120 So click on start all programs inside your ruby for that. 8 00:00:33,150 --> 00:00:42,120 There should be command line utility that is start command prompt with Ruby so you can use this. 9 00:00:42,450 --> 00:00:50,790 Alternatively if you've got kit installed it also comes with it command line utilities call it bass 10 00:00:51,660 --> 00:00:54,500 guitar bass is same thing. 11 00:00:54,500 --> 00:01:00,970 Does the same stuff as the command line does one window but is geared towards Linux. 12 00:01:01,080 --> 00:01:07,050 So have a lot of Unix command so you can do books for the purpose of this lecture. 13 00:01:07,050 --> 00:01:09,930 I'm going to be using the guitar bass option. 14 00:01:09,930 --> 00:01:17,610 I prefer that one hear it's more friendly to me so I'm going to be using this for this mixture to let 15 00:01:17,610 --> 00:01:23,200 ruby know we are going to use a single common version of Ruby. 16 00:01:23,280 --> 00:01:28,520 We need to type in common dash before we start. 17 00:01:28,530 --> 00:01:32,190 He shean the command So let me show you what I meant. 18 00:01:32,190 --> 00:01:44,490 3 typing Ruby space Das E is it d'asti that lets Ruby know you're using a single command. 19 00:01:44,850 --> 00:01:47,000 The first command going to use is called PUDs. 20 00:01:47,010 --> 00:01:49,380 I'll explain what put this in a minute. 21 00:01:49,510 --> 00:01:56,780 You quote single quote and then the word puts space followed by what she want to be. 22 00:01:56,820 --> 00:02:06,840 Put it some want to be and want to display this number or 7 4 7 then single quotes and then you hit 23 00:02:06,900 --> 00:02:16,670 return and it turns the number would basically is use to output some pain on a screen. 24 00:02:16,680 --> 00:02:22,240 Is it Rubys way of outputting your comments on the screen. 25 00:02:22,590 --> 00:02:25,970 And there is another command that does the same thing. 26 00:02:25,980 --> 00:02:27,820 Is called the print. 27 00:02:27,820 --> 00:02:28,820 What they see. 28 00:02:28,830 --> 00:02:36,750 Big difference between the print and the put are do the same command use in a print and then I'll explain 29 00:02:36,750 --> 00:02:37,710 the difference. 30 00:02:37,970 --> 00:02:42,490 So typing Ruby. 31 00:02:43,290 --> 00:02:57,300 Space that he followed by thingo quote and then print followed by 7 4 7 single quote and press enter. 32 00:02:57,450 --> 00:03:01,180 As you can see we've got the same output. 33 00:03:01,380 --> 00:03:04,640 So print put the basically do the same thing. 34 00:03:04,650 --> 00:03:11,220 They used to output on the screen but there is a key difference when you use inputs. 35 00:03:11,310 --> 00:03:17,970 It leaves a line carries carriage return not as a space have trades on the output. 36 00:03:18,300 --> 00:03:23,630 The print doesn't leave airline carriage return for look at the output or the print. 37 00:03:23,630 --> 00:03:26,090 There's no line no space underneath. 38 00:03:26,100 --> 00:03:27,790 Doesn't leave a line carry. 39 00:03:28,050 --> 00:03:29,790 Whereas the PUD does. 40 00:03:29,790 --> 00:03:33,000 So that's the key difference between use into two. 41 00:03:33,090 --> 00:03:38,180 So let me do another example using this string or a text. 42 00:03:38,220 --> 00:03:39,420 So do a ruby 43 00:03:41,670 --> 00:03:59,250 space that he put the PUDs followed by space because I am using a string only to two double quotes. 44 00:04:00,450 --> 00:04:02,280 Hello. 45 00:04:03,100 --> 00:04:12,500 Well the double quote space this single quote So this single quote might is the single quote. 46 00:04:12,590 --> 00:04:19,560 What were you using quotes the cosmos most Matt so whereby you use in a thingo is firewalls used in 47 00:04:19,570 --> 00:04:20,610 the single cause here. 48 00:04:20,700 --> 00:04:26,850 Probably will have used a double here so where you make think what is best to keep them together. 49 00:04:26,850 --> 00:04:33,290 I've used double quotes here and I have used single quotes for the PUDs so I press enter. 50 00:04:33,440 --> 00:04:35,000 As you can see here is give me. 51 00:04:35,040 --> 00:04:36,460 Hello world. 52 00:04:36,660 --> 00:04:38,180 So if I do the same. 53 00:04:38,220 --> 00:04:38,870 The print. 54 00:04:38,910 --> 00:04:45,680 I will not expect a key lying carriage return one give me the space after giving me the output. 55 00:04:45,750 --> 00:04:48,270 So let's go to an example is in the prints. 56 00:04:48,270 --> 00:04:59,670 How do Ruby space dags space thingo quote prints are way of a star. 57 00:04:59,730 --> 00:05:00,590 With a single quote. 58 00:05:00,590 --> 00:05:06,840 If he is in this train his best to use a double quote for strength so they don't get confuse. 59 00:05:07,140 --> 00:05:10,650 So too low. 60 00:05:12,140 --> 00:05:13,370 Well. 61 00:05:17,610 --> 00:05:25,930 The double quote space the single quote press to so you can see I've got the same result. 62 00:05:26,030 --> 00:05:29,000 The differences with the print we use in the print. 63 00:05:29,010 --> 00:05:37,230 It doesn't give you a single carriage return whereas it puts gives you a single carriage return so it 64 00:05:37,230 --> 00:05:42,330 has basically the key difference between the puts you in this picture when you've learned how to use 65 00:05:43,530 --> 00:05:46,910 single commands to interact with it. 66 00:05:46,920 --> 00:05:49,390 Ruby is indeed Das. 67 00:05:49,610 --> 00:05:54,260 And also we learnt what puts or puts that on. 68 00:05:54,300 --> 00:06:01,420 So what print does there used to output the ruby commands on the screen. 69 00:06:01,710 --> 00:06:02,910 Thanks for watching. 70 00:06:02,910 --> 00:06:03,880 Bye for now.