1 00:00:01,590 --> 00:00:04,290 I will create a script called Math s h 2 00:00:07,240 --> 00:00:11,680 you know that on the first line we should start a bit shall bang. 3 00:00:12,400 --> 00:00:20,180 So bin bash let's create a variable called number and assigned to the value 5. 4 00:00:20,440 --> 00:00:22,740 And now you can try on your own. 5 00:00:22,780 --> 00:00:32,130 Stop the video and do the number plus five that light double parentheses brackets an expression. 6 00:00:32,290 --> 00:00:33,830 I row start with. 7 00:00:33,970 --> 00:00:39,150 Well it should be easy. 8 00:00:40,070 --> 00:00:44,320 Well that result equals number plus five. 9 00:00:44,440 --> 00:00:47,560 Remember no spaces around plus sign. 10 00:00:47,950 --> 00:00:49,840 And now we're in the resolved 11 00:00:53,430 --> 00:00:58,880 here is out from a million dollar sign. 12 00:00:58,930 --> 00:01:02,880 Is result so this part is done. 13 00:01:02,930 --> 00:01:05,590 Let's move to double parentheses. 14 00:01:12,900 --> 00:01:22,100 Result equals dollar sign and inside double parentheses just the right number. 15 00:01:23,710 --> 00:01:28,360 Plus five for printing the result. 16 00:01:28,370 --> 00:01:40,510 I will just copy previously created equal wine and just add it to include double parentheses Yes exactly. 17 00:01:44,160 --> 00:01:46,680 Next option would be to use brackets 18 00:01:53,430 --> 00:01:53,820 so. 19 00:01:53,850 --> 00:01:54,690 Or is out. 20 00:01:54,800 --> 00:01:58,830 Equals dollar sign brackets. 21 00:01:59,220 --> 00:02:03,210 And inside it of course number plus five 22 00:02:08,530 --> 00:02:13,420 and now I will again just add it equal line. 23 00:02:20,360 --> 00:02:23,770 So now we can try to use expression exper 24 00:02:30,180 --> 00:02:40,350 sole result equals dollar sign and inside parentheses except for the assigned number 25 00:02:43,010 --> 00:02:43,850 plus five 26 00:02:48,350 --> 00:02:51,440 we could instead of Devey use pectic 27 00:03:03,940 --> 00:03:06,310 and last option is to use B.C 28 00:03:12,480 --> 00:03:26,690 and because it can operate floating balloons live will do number multiply by one point nine. 29 00:03:26,860 --> 00:03:39,150 It is important to have expression in double quotation mark followed by by. 30 00:03:39,310 --> 00:03:44,530 So here we are putting expression in double quotation mark 31 00:03:48,050 --> 00:03:50,000 now by. 32 00:03:51,290 --> 00:03:52,370 And now b c 33 00:03:59,800 --> 00:04:11,950 now we will print the result from B C. 34 00:04:12,090 --> 00:04:15,030 So it's done so we can save and scraped 35 00:04:19,250 --> 00:04:23,140 and of course we need to grant execute permission. 36 00:04:28,160 --> 00:04:29,200 Now around here 37 00:04:32,480 --> 00:04:35,530 and we have some problem here. 38 00:04:36,350 --> 00:04:38,780 So it's online. 39 00:04:38,930 --> 00:04:43,730 So just open again the editor or scraped 40 00:04:46,850 --> 00:04:56,490 by typing said no I can see the lines on a Torah so can you see it. 41 00:04:56,840 --> 00:04:59,510 You can produce some special characters in ECO. 42 00:04:59,530 --> 00:05:00,140 C'mon. 43 00:05:00,220 --> 00:05:06,150 No no don't use apostrophes so I will just add Durbach for marks here and say 44 00:05:12,760 --> 00:05:17,220 and great works perfectly now. 45 00:05:17,260 --> 00:05:21,990 Now we can use knowledge of what we have learned in previous section. 46 00:05:22,240 --> 00:05:27,940 Let's say that we want to do addition of two numbers and those two numbers should be given by user. 47 00:05:28,090 --> 00:05:29,210 Let's do it. 48 00:05:29,230 --> 00:05:35,620 Firstly I will clear the screen and create a file called month to do it. 49 00:05:35,690 --> 00:05:46,280 As age starting with Shaban on the first line as you will be in bash. 50 00:05:46,490 --> 00:05:49,420 Now let's ask user for his input. 51 00:05:49,670 --> 00:05:53,720 Eco Desch an enter first number by any parameter. 52 00:05:53,720 --> 00:05:59,170 We are ensuring that the user will type on the same line as where is our message. 53 00:05:59,280 --> 00:06:01,770 We will ask also for second number 54 00:06:06,320 --> 00:06:09,450 enter second number. 55 00:06:12,470 --> 00:06:14,850 And we will read it by read command 56 00:06:21,980 --> 00:06:22,750 type command. 57 00:06:22,760 --> 00:06:25,130 Do some of that here. 58 00:06:27,630 --> 00:06:38,430 So flat out equals first plus Second no space around equal sign or plus sign. 59 00:06:38,430 --> 00:06:53,700 Now we can print the result and save descript so equal dollar sign first Plus are sign second equals 60 00:06:54,510 --> 00:06:56,110 dollar sign. 61 00:06:56,550 --> 00:06:57,040 Result 62 00:07:02,490 --> 00:07:07,700 and saved descript. 63 00:07:07,930 --> 00:07:11,410 I am changing script permissions so everyone can run it. 64 00:07:11,740 --> 00:07:15,370 And now after changing it I will running 65 00:07:18,640 --> 00:07:21,310 entered for number two and the second number. 66 00:07:21,390 --> 00:07:26,160 Sorry 2 plus 3 equals 5. 67 00:07:26,160 --> 00:07:29,170 Great but let's make some change. 68 00:07:33,680 --> 00:07:36,440 I wrote that command do some b c 69 00:07:43,050 --> 00:07:48,600 result Igor's and into Bechtel's level print ICO. 70 00:07:48,700 --> 00:07:54,340 Now the above quotation marks and inside it we will write some expression for example. 71 00:07:54,350 --> 00:07:55,130 Dollar sign. 72 00:07:55,130 --> 00:07:59,240 First xponent dollar signs second. 73 00:07:59,270 --> 00:08:08,480 Now the pipe and B.C see the difference between light and B.C.E. that don't use any dollar sign in front 74 00:08:08,480 --> 00:08:11,960 of variables where S B C is quite opposite. 75 00:08:12,200 --> 00:08:19,180 And don't forget that for B C you'll need to first print the expression inside double quotation marks. 76 00:08:19,190 --> 00:08:22,550 This is the reason why we are using eco here. 77 00:08:25,570 --> 00:08:32,510 Now let's print the result of that exponent operation equal sign. 78 00:08:32,530 --> 00:08:47,910 First ex-porn symbol Dorson second equals sign rezoned subscript 79 00:08:51,630 --> 00:08:53,690 and right 80 00:08:56,640 --> 00:08:59,350 and the first number two and number three. 81 00:08:59,740 --> 00:09:02,580 Yeah great works nicely. 82 00:09:02,580 --> 00:09:09,550 Two plus three equals five and two exponent symbol three equals eight. 83 00:09:09,770 --> 00:09:10,850 Great works nicely.