1
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- All right, let's write a script.

2
00:00:08,910 --> 00:00:10,230
What do we need to do?

3
00:00:10,230 --> 00:00:13,770
The script should prompt for
the user to enter a color

4
00:00:13,770 --> 00:00:16,620
and the name of this color
should be stored in a variable.

5
00:00:16,620 --> 00:00:18,390
And the script should loop in such a way

6
00:00:18,390 --> 00:00:21,517
that every 10 seconds, it'll
prompt for the message,

7
00:00:21,517 --> 00:00:22,890
"The color is on screen"

8
00:00:22,890 --> 00:00:25,440
and ensure that instead of whatever,

9
00:00:25,440 --> 00:00:28,110
the actual color name is printed.

10
00:00:28,110 --> 00:00:30,900
Start the script in a way
that it takes a lower priority

11
00:00:30,900 --> 00:00:33,963
than other processes
running on your computer.

12
00:00:35,010 --> 00:00:36,033
Okay, let's do it.

13
00:00:39,030 --> 00:00:42,033
So I'm calling this script color.sh.

14
00:00:43,320 --> 00:00:45,960
The assignment is not
mentioning any names,

15
00:00:45,960 --> 00:00:49,200
so I'm figuring out something myself.

16
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A script should always start with shebang,

17
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so there we go.

18
00:00:53,160 --> 00:00:56,877
And then, "echo enter a color".

19
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"read COLOR".

20
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That will create the variable
that the user is entering.

21
00:01:05,070 --> 00:01:06,660
And then we need the script to loop

22
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in such a way that every 10 seconds,

23
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it'll prompt a message "The color is".

24
00:01:10,530 --> 00:01:15,530
So "while sleep 10,

25
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do

26
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echo the color is $COLOR

27
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done."

28
00:01:26,130 --> 00:01:27,183
That seems to be it.

29
00:01:28,140 --> 00:01:29,610
And then we need to start a script

30
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in such a way that it
takes a lower priority

31
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than all the processes
running on your computer.

32
00:01:35,430 --> 00:01:38,137
So, let's first make it executable,

33
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"chmod + x color.sh"

34
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and then let's use "nice 19 color.sh".

35
00:01:51,630 --> 00:01:53,310
Oops, my mistake.

36
00:01:53,310 --> 00:01:55,140
That's why you should
always check some help

37
00:01:55,140 --> 00:01:57,690
if you don't use it on a regular basis.

38
00:01:57,690 --> 00:02:00,810
And let me use "nice minus minus help"

39
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to see what we need to do.

40
00:02:02,070 --> 00:02:05,970
Ah, "nice minus minus n"

41
00:02:05,970 --> 00:02:07,770
followed by the 19.

42
00:02:07,770 --> 00:02:09,123
So, we were almost there.

43
00:02:13,620 --> 00:02:15,307
And then it's giving me an error,

44
00:02:15,307 --> 00:02:16,590
"No such file or directory"

45
00:02:16,590 --> 00:02:20,160
because color.sh isn't
the current directory.

46
00:02:20,160 --> 00:02:21,423
But now we are good.

47
00:02:22,740 --> 00:02:24,813
So we need to wait for 10 seconds.

48
00:02:26,520 --> 00:02:27,353
And there we go.

49
00:02:27,353 --> 00:02:28,650
The color is blue.

50
00:02:28,650 --> 00:02:31,590
Feel free to wait another
10 seconds to verify

51
00:02:31,590 --> 00:02:35,640
that the while loop is doing
what you expected to do.

52
00:02:35,640 --> 00:02:39,870
I would really advise
you to see at least twice

53
00:02:39,870 --> 00:02:41,370
that it's working all right.

54
00:02:41,370 --> 00:02:44,070
Three times, if that
makes you feel better.

55
00:02:44,070 --> 00:02:45,780
And if you're seeing it three times,

56
00:02:45,780 --> 00:02:47,433
then, you should be okay.

57
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Right, that's all.