1 00:00:01,050 --> 00:00:05,380 In location of your own grade script called explicit 2 00:00:08,240 --> 00:00:09,410 on the first line. 3 00:00:09,440 --> 00:00:11,130 Let's start with a bang 4 00:00:13,610 --> 00:00:19,720 followed by bin bash on the end of the line. 5 00:00:19,790 --> 00:00:28,670 We can create a variable called Count and assign value 5 to it. 6 00:00:28,670 --> 00:00:32,350 Now we would like to display value of variable count. 7 00:00:32,690 --> 00:00:42,780 So we are using common echo count equals dollar assigned count. 8 00:00:42,790 --> 00:00:47,280 Now let's say we need an exit editor 9 00:00:51,610 --> 00:00:55,550 now we need to add executive permission to our script. 10 00:00:56,200 --> 00:00:57,860 Let's do that with changement 11 00:01:01,480 --> 00:01:04,580 and we can see that script can be done. 12 00:01:04,990 --> 00:01:05,880 So let's run it. 13 00:01:11,430 --> 00:01:12,150 Nice. 14 00:01:12,210 --> 00:01:15,030 We can see Count equals five. 15 00:01:15,180 --> 00:01:18,720 It's working perfectly. 16 00:01:19,170 --> 00:01:20,690 Open your script again. 17 00:01:20,910 --> 00:01:27,470 You may have noticed that I used apostrophes in the echo command here without apostrophes. 18 00:01:27,570 --> 00:01:34,260 The script works just fine but in some cases some symbols may be interpreted wrongly and I will just 19 00:01:34,260 --> 00:01:36,420 show you that right. 20 00:01:36,450 --> 00:01:37,300 Ico. 21 00:01:37,590 --> 00:01:40,870 Hello backslash. 22 00:01:41,880 --> 00:01:46,850 Just want to display backslash 23 00:01:50,350 --> 00:01:52,920 on the next line. 24 00:01:53,170 --> 00:01:56,420 Bright eco. 25 00:01:56,540 --> 00:02:04,250 It's a good day to learn and save discrete 26 00:02:07,940 --> 00:02:09,500 running in output. 27 00:02:09,490 --> 00:02:13,990 We see that the backslash wasn't even displayed. 28 00:02:14,000 --> 00:02:23,420 Also we see dead single quotation mark in it's causes some error as Abeche is looking for matching single 29 00:02:23,420 --> 00:02:26,110 quotation mark which cannot be found. 30 00:02:26,450 --> 00:02:34,310 Basically what this means is that some characters has special meaning special function and when we use 31 00:02:34,310 --> 00:02:35,780 them in echo command. 32 00:02:35,810 --> 00:02:47,420 Without apostrophes they are not behaving as normal characters but is something with special function. 33 00:02:47,510 --> 00:02:50,250 Let's open the script again. 34 00:02:53,070 --> 00:03:00,080 And in that script remove the last two lines. 35 00:03:00,240 --> 00:03:07,990 Now let's just use you could come home without any apostrophes and without any special characters to 36 00:03:07,990 --> 00:03:10,620 see that it is working without an issue. 37 00:03:12,830 --> 00:03:22,610 Ico we have a lot sun count oranges save descript and Adani 38 00:03:26,280 --> 00:03:29,230 you'll see that it is working well. 39 00:03:30,270 --> 00:03:33,300 But there let's make some error in assigning a variable 40 00:03:39,240 --> 00:03:40,680 under newline 41 00:03:43,320 --> 00:03:48,320 write count equals 42 00:03:54,040 --> 00:04:02,010 space Sikh's you know that there should be no space next to the equal sign. 43 00:04:02,010 --> 00:04:10,450 When we run the script we got arrows saying six command not found Briefing's dead signing but it's done 44 00:04:10,850 --> 00:04:16,950 and that we want to run a common six. 45 00:04:17,050 --> 00:04:20,140 Now let's check in think of a sentence. 46 00:04:20,140 --> 00:04:27,470 Open the script and Firstly remove the line causing us all to count equal spaces. 47 00:04:27,550 --> 00:04:28,370 Just delete it. 48 00:04:30,670 --> 00:04:42,270 On the new line we can assign some sentence to variable message so type message 49 00:04:46,660 --> 00:04:55,810 equals Hello body and what I did without any apostrophes on the next line. 50 00:04:55,980 --> 00:04:57,160 Just printed message 51 00:05:04,280 --> 00:05:11,080 message is equal to dollar sign message save descript 52 00:05:14,680 --> 00:05:15,290 and that on the 53 00:05:18,560 --> 00:05:25,020 we see that there is an error because we didn't use apostrophes when assigning string sentence Bush 54 00:05:25,110 --> 00:05:28,410 fings did the assigning but is only a message. 55 00:05:28,430 --> 00:05:30,110 Equals Hello. 56 00:05:30,530 --> 00:05:33,440 And then is some command called Buddy. 57 00:05:33,470 --> 00:05:40,900 It is important to not is did assigning bad message equals hello has no importance to underline. 58 00:05:40,940 --> 00:05:42,510 Continue with some command. 59 00:05:42,680 --> 00:05:47,640 You can see here dead no value of message was printed. 60 00:05:50,650 --> 00:05:57,640 In the output we see by the command not found but will happen if we change it to some command which 61 00:05:57,730 --> 00:05:59,250 rarely exits. 62 00:05:59,350 --> 00:06:01,750 Open the script and let's make the change 63 00:06:06,760 --> 00:06:10,240 replace divert badly with some existing command. 64 00:06:10,240 --> 00:06:17,200 For example allow us to save the script and run it. 65 00:06:17,200 --> 00:06:24,940 Here we see that a SQL month was printed and I see content of my directory containing only one script 66 00:06:25,940 --> 00:06:33,670 the message variable was not printed as in the last example. 67 00:06:33,900 --> 00:06:41,820 We basically come across all explicit definition and you know now how to assign a variable using this 68 00:06:41,820 --> 00:06:42,690 method. 69 00:06:43,050 --> 00:06:48,990 But let's finish this lecture with a working script which will print us readable value held by the 70 00:06:51,880 --> 00:06:58,840 so open that script and I will apostrophe's. 71 00:06:58,960 --> 00:07:08,080 And by that I mean double quotation mark at the beginning and a D and a value of variable message. 72 00:07:08,080 --> 00:07:15,460 Now save the script and run it and voila everything works perfectly.