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Is it better practice to use String.format over string Concatenation in Java?
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They are all bad practice. Use StringBuilder.
– Amir Raminfar
Aug 11 '11 at 16:37
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How do I install an old version of Django on virtualenv?
...d question, since the very purpose of virtualenv is to this exactly: Installing some specific version of a package (in this case Django) inside the virtual environment. But it's exactly what I want to do, and I can't figure it out.
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How to exit if a command failed?
...on-zero).
Using ( ) makes the command inside them run in a sub-shell and calling a exit from there causes you to exit the sub-shell and not your original shell, hence execution continues in your original shell.
To overcome this use { }
The last two changes are required by bash.
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XPath to find elements that does not have an id or class
How can I get all tr elements without id attribute?
4 Answers
4
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CSS - Overflow: Scroll; - Always show vertical scroll bar?
... 4em and scroll to show the rest */
}
#child {
height: 12em;
/* taller than the parent to force scrolling */
}
/* === ignore stuff below, it's just to help with the visual. === */
#container {
background-color: #ffc;
}
#child {
margin: 30px;
background-color: #eee;
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Generic Repository With EF 4.1 what is the point
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You are actually right. DbContext is an implementation of the unit of work pattern and IDbSet is an implementation of the repository pattern.
Repositories are currently very popular and overused. Everybody use them just because there ar...
Style disabled button with CSS
...he disabled buttons you can use the :disabled pseudo-element. It works for all the elements.
For browsers/devices supporting CSS2 only, you can use the [disabled] selector.
As with the image, don't put an image in the button. Use CSS background-image with background-position and background-repeat....
Are NSLayoutConstraints animatable? [duplicate]
...g now (I was using this pattern before but still with no success)...I was calling setNeedsLayout instead of layoutIfNeeded Surely a DOH moment! Actually just changing a constraint automatically calls setNeedsLayout so I guess layoutIfNeeded overrides it somehow.
– borrrden
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What is the difference between Left, Right, Outer and Inner Joins?
I am wondering how to differentiate all these different joins ...
9 Answers
9
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Quick-and-dirty way to ensure only one instance of a shell script is running at a time
... signal but just checks if a process with the given PID exists. Also the call to trap will ensure that the lockfile is removed even when your process is killed (except kill -9).
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