1
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Open our script files and of age

2
00:00:10,730 --> 00:00:16,130
it would be good to know if user has entered some location.

3
00:00:16,150 --> 00:00:23,460
So for that case we can create variable which will as if location was set or not.

4
00:00:25,930 --> 00:00:35,890
So set into variable and let's name it lockset value valuable.

5
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And before starting.

6
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While loop set that variable value 0

7
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and we can also write the command.

8
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What it means.

9
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So 0 represents that location is not set.

10
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And number one

11
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will in that case mean that location was set by an.

12
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So that means if user specified some location and value of variable lockset would be on the device it

13
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will be still zero

14
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in the same way we can create variable starts and these mean if user vaunts from script some statistics

15
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this variable will have to come and revise it if you will have value 0.

16
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We can also write some comment here.

17
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So one means do not display statistics

18
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and one means this by statistics

19
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but why we need that variables in a case of location.

20
00:02:21,460 --> 00:02:28,130
We need to know that information because of a news or don't use location parameter don't specify a location.

21
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We should use his or her current directory.

22
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So after dumb keyboard of a WHILE loop right if statement.

23
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So if a value of variable lockset

24
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is not equal to one

25
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then we can set into variable location output of B W D command.

26
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And for that we will use command substitution.

27
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So if user didn't specify a location we are using current directory.

28
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And after this if statement we can print using eco commom value of variable location

29
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now save the file and we can run the script so we don't parameter it.

30
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My current directory.

31
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OK this is working.

32
00:03:51,060 --> 00:03:55,160
But what if I specify another location.

33
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For example EDC

34
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So using our parameter I specify new directory.

35
00:04:05,680 --> 00:04:13,090
And it prints the location is it is the same it is for bin directory.

36
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This is working.

37
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Now I tried the right tools barometer location

38
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and it is working in the same way.

39
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Great.

40
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And if I use some not existing permit that I will get printed usage message grade.