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What is the $? (dollar question mark) variable in shell scripting? [duplicate]
I'm trying to learn shell scripting, and I need to understand someone else's code. What is the $? variable hold? I can't Google search the answer because they block punctuation characters.
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Check if a Bash array contains a value
...ince array_to_string_internal() in array.c still loops over array elements and concatenates them into a string, it's probably not more efficient than the looping solutions proposed, but it's more readable.
if [[ " ${array[@]} " =~ " ${value} " ]]; then
# whatever you want to do when array conta...
How to “git clone” including submodules?
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With version 2.13 of Git and later, --recurse-submodules can be used instead of --recursive:
git clone --recurse-submodules -j8 git://github.com/foo/bar.git
cd bar
Editor’s note: -j8 is an optional performance optimization that became available ...
Generate an integer that is not among four billion given ones
...nge.
If "integer" means mathematical integer: Read through the input once and keep track of the largest number length of the longest number you've ever seen. When you're done, output the maximum plus one a random number that has one more digit. (One of the numbers in the file may be a bignum that t...
Storing DateTime (UTC) vs. storing DateTimeOffset
...ing from/to the database does DateTime conversion (from UTC to local time, and from local time to UTC), so I can use DateTime.Now (derivations and comparisions) throughout the system without worrying about time zones.
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Unable to understand useCapture parameter in addEventListener
...eveloper.mozilla.org/en/DOM/element.addEventListener but unable to understand useCapture attribute. Definition there is:
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How to use java.String.format in Scala?
...d know how it should display the string. %s is probably the most common, and it just means that the argument should be treated as a string.
I won't list every option, but I'll give a few examples just to give you an idea:
// we can specify the # of decimals we want to show for a floating point:
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CSS Display an Image Resized and Cropped
I want to show an image from an URL with a certain width and height even if it has a different size ratio.
So I want to resize (maintaining the ratio) and then cut the image to the size I want.
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Enums and Constants. Which to use when?
I was doing some reading on enums and find them very similar to declaring constants. How would I know when to use a constant rather than an enum or vice versa. What are some of the advantages of using enums?
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Site stopped working in asp.net System.Web.WebPages.Razor.Configuration.HostSection cannot be cast t
...g contains the proper version for the assembly "System.Web.WebPages.Razor" and "System.Web.Mvc". Check for their actual existence as well as my "System.Web.WebPages.Razor" assembly tag was missing causing the error. I had my assembly versions set to 3.0 and 5.0 respectively in the time of this writ...