Does the database exist?

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Does the database exist?

Steve Jones - SSC Editor

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November 3, 2014 at 10:03 pm

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Stuart Davies SSCoach Points: 19505 More actions · Answer 1

Thanks for the question - to play safe I left until after my first coffee

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Alex Gay SSCrazy Points: 2211 More actions · Answer 2

DIR is an alias. The command behind it is Get-ChildItem.

Koen Verbeeck SSC Guru Points: 259085 More actions · Answer 3

Nice question, thanks.

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Hany Helmy SSChampion Points: 13921 More actions · Answer 4

Stewart "Arturius" Campbell (11/4/2014)
Interesting question, thanks Steve
Haven't played with powershell much lately, so learned something new today.

+1 same here 🙂

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Hany Helmy
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Ed Wagner SSC Guru Points: 287024 More actions · Answer 5

I haven't played with PowerShell much at all.

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Brian.Klinect Mr or Mrs. 500 Points: 592 More actions · Answer 6

Alex Gay (11/4/2014)
DIR is an alias. The command behind it is Get-ChildItem.

There's a whole slew of commands that are aliased as DIR is. I believe powershell aliased the same commands used in the command prompt so that users can use either.

Andy sql SSCrazy Eights Points: 9481 More actions · Answer 7

Alex gets a +1

It is a very important concept in the Powershell world; in this example, the "dir" alias doesn't just return a list of databases - it returns an object for each database. Additional commands can be made on these objects, as well as piping the objects to another cmdlet. Steve's question is still valid and 100% accurate (of course!).

Luis Cazares SSC Guru Points: 183698 More actions · Answer 8

In case anyone wants a link to official documentation in BOL.

http://msdn.microsoft.com/en-us/library/hh213536.aspx

Luis C.
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Raghavendra Mudugal SSChampion Points: 10658 More actions · Answer 9

Alex Gay (11/4/2014)
DIR is an alias. The command behind it is Get-ChildItem.

(to my knowledge..) DIR is a DOS command which also can be used in PS without aliasing. Once you connect to the SQLPS use the CD command to change the path and use the DIR to list the directories or the LS( "ls") command at each stage.

ww; Raghu
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Ken SSCoach Points: 17191 More actions · Answer 10

Great question. I don't use PowerShell at all currently but the more I read up on it, the more I can see uses for it. Knowing that some of the commands are aliased to use more familiar command line terms like "dir" is a big help. Thanks Steve.

akljfhnlaflkj SSC Guru Points: 76202 More actions · Answer 11

I'm not a powershell user so thanks for the education.

Andy sql SSCrazy Eights Points: 9481 More actions · Answer 12

As mentioned earlier by Alex, "dir" is an alias for "Get-ChildItem". It might, as a casual user, look like it produces the same results as the old DOS command of the same name, but it is very important to understand that this is the PowerShell world, not simply running DOS commands in PowerShell.

TomThomson SSC Guru Points: 104773 More actions · Answer 13

Andy sql (11/4/2014)
Alex gets a +1
It is a very important concept in the Powershell world; in this example, the "dir" alias doesn't just return a list of databases - it returns an object for each database. Additional commands can be made on these objects, as well as piping the objects to another cmdlet. Steve's question is still valid and 100% accurate (of course!).

100% accurate? Well, maybe whether it works or not depends what CD (ie sl, Set-Location) commands you have executed before DIR DATABASES. If you aren't at DEFAULT will DIR DATABASES work? Of course it's maybe a reasonable assumption that your location is SQLSERVER:\SQL\MyComputer\DEFAULT, but reasonable assumptions sometimes lead to undesirable results. So let's say 99.995% accurate just to be pedantic and allow for the one time in 20000 when your curent location is not the default. :hehe:

Besides, I would probably type ls instead of DIR because I was using ls before ms dos existed.

Tom