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Show pending migrations in rails
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How do you read the output of this command? If the status of a row is "down", does that mean it's a pending migration?
– Dennis
Feb 13 '15 at 15:00
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Is double square brackets [[ ]] preferable over single square brackets [ ] in Bash?
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[[ has fewer surprises and is generally safer to use. But it is not portable - POSIX doesn't specify what it does and only some shells support it (beside bash, I heard ksh supports it too). For example, you can do
[[ -e $b ]]
to test whether a ...
How to create Windows EventLog source from command line?
...events.
Type eventcreate /? in CMD prompt
Microsoft TechNet: Windows Command-Line Reference: Eventcreate
SS64: Windows Command-Line Reference: Eventcreate
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What is a dependency property?
...cy properties are properties of classes that derive from DependencyObject, and they're special in that rather than simply using a backing field to store their value, they use some helper methods on DependencyObject.
The nicest thing about them is that they have all the plumbing for data binding bui...
Simulate airplane mode in iPhone Simulator
... emulate the iPhone; it's just an environment for Mac apps to link against and look like an iPhone. So you need a way, at the system layer, to restrict an app from talking to the network. Unix doesn't provide that; it would almost certainly need kernel support to get it. You could do it more easily ...
cmake and libpthread
I'm running RHEL 5.1 and use gcc .
3 Answers
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AWS ssh access 'Permission denied (publickey)' issue [closed]
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if you try root and you get "Please login as the ec2-user user rather than root user.'" use ec2-user in place of root.
– Tony
Jun 24 '11 at 11:27
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How do I get the value of a textbox using jQuery?
...Info which took me long time to find.what if you were using the field name and not id for identifying the form field. You do it like this:
For radio button:
var inp= $('input:radio[name=PatientPreviouslyReceivedDrug]:checked').val();
For textbox:
var txt=$('input:text[name=DrugDurationLength]...
How do I create a unique constraint that also allows nulls?
...er below.
Prior to SQL Server 2008
You cannot create a UNIQUE constraint and allow NULLs. You need set a default value of NEWID().
Update the existing values to NEWID() where NULL before creating the UNIQUE constraint.
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Assigning default values to shell variables with a single command in bash
... answered Jan 6 '10 at 14:36
Andrew McGregorAndrew McGregor
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