1 00:00:01,260 --> 00:00:05,770 Variables are used to store a value that can be changed. 2 00:00:05,910 --> 00:00:12,470 We basically have silly ways in how to assign a value to a variable. 3 00:00:12,480 --> 00:00:20,450 First one is explicit definition where we assign some value to a variable using equal sign. 4 00:00:20,450 --> 00:00:30,020 Second option is to use eddied command where we store some user input into variable so that option is 5 00:00:30,110 --> 00:00:31,390 command substitution. 6 00:00:31,490 --> 00:00:37,230 And basically we are storing here output of some command into a variable. 7 00:00:37,220 --> 00:00:43,400 Now let's look more deeply on the first wé how to assign value to a variable. 8 00:00:43,400 --> 00:00:48,780 Explicit definition for explicit definition. 9 00:00:48,920 --> 00:00:51,610 We are using the name of deplorable. 10 00:00:51,660 --> 00:00:56,370 He represents a survivor equal sign and a value. 11 00:00:56,390 --> 00:00:58,880 We want to sign into variable. 12 00:00:58,940 --> 00:01:05,960 Keep in mind that you cannot do any spaces next to the equal sign which is hard if you already have 13 00:01:05,960 --> 00:01:08,040 a word with some programming languages. 14 00:01:08,210 --> 00:01:12,560 But it has a very good reason and I will tell you later in this lecture. 15 00:01:12,800 --> 00:01:17,530 But now let's check some more examples of explicit definition. 16 00:01:19,730 --> 00:01:21,360 Count equals five. 17 00:01:21,380 --> 00:01:26,480 Here you can see that we can store number but equals Wardley. 18 00:01:26,780 --> 00:01:33,810 We can definitely store a path into a variable dogs number equals a. 19 00:01:34,180 --> 00:01:40,750 In most programming languages this would be the correct way how to assign value 8 into variable called 20 00:01:40,870 --> 00:01:41,990 dog's number. 21 00:01:42,400 --> 00:01:45,400 But do remember what I told you at the beginning. 22 00:01:45,610 --> 00:01:55,240 In beshe when we are assigning value to a variable we cannot have any space next to equal sign. 23 00:01:55,260 --> 00:02:00,740 Why is that because of all the Bessy's is not an assigning Barbash instead. 24 00:02:00,880 --> 00:02:09,600 Things that you want to try to run a command called Dachs number with two arguments equal sign is the 25 00:02:09,600 --> 00:02:13,710 first Egmond and number 8 is the second argument. 26 00:02:14,380 --> 00:02:22,290 It is really important to keep in mind that only UNIX like systems when we call some command we starting 27 00:02:22,300 --> 00:02:25,000 by calling the name of that command. 28 00:02:25,330 --> 00:02:35,870 There is the space and some arguments we can take as an example as common here we have Alpers space 29 00:02:36,500 --> 00:02:44,690 and Desch L as their first argument and because we can use in bash system commands such as our s b w 30 00:02:44,690 --> 00:02:47,880 d changement measure needs some way. 31 00:02:47,890 --> 00:02:54,820 How to differentiate between calling some commands and assigning some value to a variable. 32 00:02:54,890 --> 00:03:03,500 So because of that we don't use any spaces next to equal sign in beshe when assigning value to a variable 33 00:03:06,250 --> 00:03:09,060 as we can see in another example. 34 00:03:09,070 --> 00:03:17,470 We can store it into variabilis some text but when we want to store some sentence we need to use apostrophes 35 00:03:17,740 --> 00:03:20,410 to properly store a whole sentence. 36 00:03:20,710 --> 00:03:28,700 If we don't do that you would think that in our examples we are trying to ram a command body after assigning. 37 00:03:28,700 --> 00:03:35,590 But you may have noticed that I am using variable names in capital letter. 38 00:03:35,590 --> 00:03:36,990 This is not needed. 39 00:03:37,000 --> 00:03:43,930 You can definitely use global reggae's if you want but in most scripts it's a variable represented by 40 00:03:43,930 --> 00:03:45,360 a capital letter. 41 00:03:45,370 --> 00:03:48,880 So my recommendation is stick to that convention. 42 00:03:50,100 --> 00:03:58,350 Now let's check how we can access the variables we are accessing variables by prepending dollar sign 43 00:03:58,620 --> 00:04:00,990 before the name of a variable. 44 00:04:01,200 --> 00:04:05,790 But instead of talking write some script to see how it is behaving.