Gem from the UrbanGiraffe blog.
To close a frozen SSH connection, just type in the following order…
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Close a frozen SSH connection
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Tag Archives: tips
Textwrangler Tips – Compare files, keyboard shortcuts
A few quick TextWrangler tips.
I never knew until recently that you can compare files in TextWrangler… and its easy.
Simply highlight the 2 files you want to compare in the Documents drawer, right click on them and select the option ‘Compare Selected Documents‘.
Now the 2 files will open into 2 windows with a review of the differences below them. You can then apply the differences in either direction.
Another tip is adding keyboard shortcuts to TextWrangler’s menu options.
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Odd or Even Number
I love gems like this. I come across them from time to time but they never stick… then I do a search to find them again.
Anyway a simple way to determine if a number is odd or even, use the following code.
function is_odd( $number ) {
return $number & 1;
}
Quick explanation
& is a binary AND.
If you have a binary value, and you AND with another binary value, then the result will be the bitwise AND of the two.
Binary values are a series of bits or 1′s and 0′s. However we are only concerned with the rightmost one ( the least significant bit ) as when a binary value ends with a 1, it is odd… when it ends with a 0 it is even.
Now, if I pass that function say the number 13, the binary value will look like 1101.
When you AND with a 1, or binary value 0001, it looks like this…
1101 & 0001 = 0001
We look to the least significant bit, which is a 1, which means the number is odd.
A simple explanation of binary can be found here.
