1 00:00:02,620 --> 00:00:09,460 So let's start building our final script grade file called files that age 2 00:00:13,020 --> 00:00:17,070 on different lines starting with champagne. 3 00:00:19,660 --> 00:00:28,150 And on the next line write description what we are going to build that we are building script files 4 00:00:28,420 --> 00:00:38,410 as age which can takes barometers dish out followed by location or parameter location followed by location 5 00:00:39,140 --> 00:00:53,650 then barometer E followed by extension or parameter extension followed by extension then it can express 6 00:00:53,810 --> 00:01:04,800 Meteora age or barometer help. 7 00:01:04,810 --> 00:01:09,380 Now we need to know what parameters are selected by user. 8 00:01:09,380 --> 00:01:12,570 So we will read arguments. 9 00:01:12,770 --> 00:01:20,480 So right while number of arguments is greater than zero. 10 00:01:20,480 --> 00:01:29,550 So for that condition we will perform something between keyboards do and an. 11 00:01:29,760 --> 00:01:33,710 Now we need to ask what is the first argument 12 00:01:41,620 --> 00:01:48,440 and if the first argument is Desch how or does the education 13 00:02:00,840 --> 00:02:04,950 we will assign into variable location 14 00:02:07,740 --> 00:02:12,000 value of second argument. 15 00:02:12,000 --> 00:02:13,250 Why. 16 00:02:13,260 --> 00:02:20,670 Because we are expecting a location of value right after the parameter or a parameter location. 17 00:02:24,080 --> 00:02:31,400 We can ensure that value of variable location is really a directory using this thing operand. 18 00:02:31,490 --> 00:02:31,960 The 19 00:02:43,530 --> 00:02:52,910 and if location is not a directory we can put an end to user information how to use our script 20 00:02:56,570 --> 00:03:05,040 so override each Richie's function will create lately. 21 00:03:05,330 --> 00:03:12,920 Now if location is a directory we can throw away two arguments one for barometer and one for location 22 00:03:12,950 --> 00:03:14,770 value. 23 00:03:16,160 --> 00:03:21,860 So now if the first argument is to eat or a dish dish extension 24 00:03:27,440 --> 00:03:38,500 we will assign it to variable x the value of second argument. 25 00:03:39,180 --> 00:03:42,540 Second argument is represented as dollar sign too. 26 00:03:43,230 --> 00:03:47,310 And then you can just throw away first two arguments. 27 00:03:47,340 --> 00:03:57,660 This is the same as we did for obligacion. 28 00:03:58,650 --> 00:04:04,650 If the first argument is that s or a dash dash starts before now 29 00:04:07,290 --> 00:04:13,410 just for that argument because we will come back to this section later. 30 00:04:17,180 --> 00:04:22,640 And if it is the first argument Desch age or does it help 31 00:04:32,970 --> 00:04:40,330 the fro of a moment and also you can display some usage information. 32 00:04:40,350 --> 00:04:42,480 So we are calling function usage 33 00:04:46,490 --> 00:04:55,940 and now if the first argument has some different value with that friend to users information how to 34 00:04:55,940 --> 00:04:57,020 use our script. 35 00:04:57,020 --> 00:04:59,390 So again calling the function usage 36 00:05:02,640 --> 00:05:12,030 now we can close K-State and then and we can right now the usage function because it is not defined 37 00:05:12,030 --> 00:05:16,120 it. 38 00:05:16,770 --> 00:05:21,950 So before the actual calling of that function we are creating a function usage 39 00:05:24,960 --> 00:05:31,410 and in that function we can print using equal command 40 00:05:34,070 --> 00:05:34,950 use each 41 00:05:37,710 --> 00:05:43,610 dollar sign zero which represents scathed name. 42 00:05:43,740 --> 00:05:53,100 And then we can just copy the description from our own and after pasting this 43 00:06:00,120 --> 00:06:07,690 we can also put into some examples it will be good for them to see how the script can be used in some 44 00:06:07,690 --> 00:06:08,540 examples. 45 00:06:18,760 --> 00:06:31,870 So now on a new line we can write to using eco command for example examples and then we need to specify 46 00:06:32,050 --> 00:06:33,770 some examples. 47 00:06:34,030 --> 00:06:42,730 So on another line again Rideman eco commom and right have to assign zero which represents our script 48 00:06:42,730 --> 00:06:44,120 name. 49 00:06:44,140 --> 00:06:54,440 And you can use for example our barometer for location and also you can specify Paromita the parameter 50 00:06:54,450 --> 00:06:56,380 s and on. 51 00:06:56,410 --> 00:07:08,890 Another example we can for example specify the parameter and parameter starts and that's all. 52 00:07:09,220 --> 00:07:16,320 And exit this function with X is that those 1. 53 00:07:16,370 --> 00:07:27,830 Now we have basic structure of our script so we can say it is a good permissions. 54 00:07:28,410 --> 00:07:33,990 And for now that I do run into but I meet are out and do some allocation 55 00:07:41,780 --> 00:07:45,980 it doesn't print anything which is good as no error is printed. 56 00:07:46,040 --> 00:07:48,520 Same with parameter as. 57 00:07:50,240 --> 00:07:53,250 And then we can ask for help 58 00:07:57,390 --> 00:07:58,330 and it is working. 59 00:07:58,330 --> 00:07:59,450 We see usage message. 60 00:07:59,470 --> 00:08:01,000 Good. 61 00:08:01,140 --> 00:08:05,470 Now we can check if you get error message 4 extension parameter 62 00:08:11,440 --> 00:08:13,060 and no we didn't. 63 00:08:13,060 --> 00:08:14,930 It worked fine for now. 64 00:08:15,220 --> 00:08:20,620 So in next lecture we can add more functionality into our script.