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Ruby on Rails: How can I revert a migration with rake db:migrate?
After installing devise MODEL User i got this.
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How to allow only one radio button to be checked?
This is a part my django template, what it supposed to do is to print out several radio buttons, corresponding to the answers assigned to the buttons. But I don't know why I can check multiple radio buttons, which messed me up. It is supposed to only let me check on one radio button and I had that...
How to create an array of object literals in a loop?
I need to create an array of object literals like this:
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Why does parseInt(1/0, 19) return 18?
I have an annoying problem in JavaScript .
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How can I get the Google cache age of any URL or web page? [closed]
In my project I need the Google cache age to be added as important information. I tried to search sources for the Google cache age, that is, the number of days since Google last re-indexed the page listed.
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Delete all lines beginning with a # from a file
All of the lines with comments in a file begin with # . How can I delete all of the lines (and only those lines) which begin with # ? Other lines containing # , but not at the beginning of the line should be ignored.
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Where to learn about VS debugger 'magic names'
If you've ever used Reflector, you probably noticed that the C# compiler generates types, methods, fields, and local variables, that deserve 'special' display by the debugger. For instance, local variables beginning with 'CS$' are not displayed to the user. There are other special naming conventions...
How can I “unuse” a namespace?
One of the vagaries of my development system (Codegear C++Builder) is that some of the auto-generated headers insist on having...
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How do I properly clean up Excel interop objects?
I'm using the Excel interop in C# ( ApplicationClass ) and have placed the following code in my finally clause:
41 Answers
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Set the value of a variable with the result of a command in a Windows batch file
When working in a Bash environment, to set the value of a variable as the result of a command, I usually do:
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