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How do I upgrade my ruby 1.9.2-p0 to the latest patch level using rvm?
...your project to using the newly-copied gemset (I recommend using an .rvmrc file in your project directory) and see if your code fails. If it does, changing back to the old ruby version is just a matter of switching the gemset.
But even if you don't use gemsets (though I assume you do since you tagg...
A Regex that will never be matched by anything
...a" and return a negative match. I see it take ~480ms to scan a ~275k line file. The converse "a^" takes about the same time, even if it might seem more efficient. On the other hand, a negative lookahead need not scan anything: "(?!x)x" (anything not followed by an x also followed by an x, i.e. no...
How can I have a newline in a string in sh?
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Worked well for me here. I've used to create a file based on this echo and it generated new lines on the output correctly.
– Mateus Leon
May 28 '16 at 4:19
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Force IE compatibility mode off using tags
...his answer to a related question, "edge" mode can be set in the Web.Config file. This will make it apply to all HTML returned from the application without the need to insert it into individual pages:
<configuration>
<system.webServer>
<httpProtocol>
<cus...
Check if a Bash array contains a value
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I thought this was going to work for me in comparing file types but found that as the counters increased it was counting up too many values... boo!
– Mike Q
Jan 24 '14 at 22:02
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How to serialize an object into a string
I am able to serialize an object into a file and then restore it again as is shown in the next code snippet. I would like to serialize the object into a string and store into a database instead. Can anyone help me?
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How to check for a valid Base64 encoded string
..., especially if the string is large (which happens when transferring large files). The following approach tries the fastest ways of detection first.
public static class HelperExtensions {
// Characters that are used in base64 strings.
private static Char[] Base64Chars = new[] { 'A', 'B', 'C...
How can I clear scrollback buffer in Tmux?
...e time. Here's the best I've come up with. Put this into your .tmux.conf file:
bind -n C-k clear-history
This binds ctrl-k to the tmux clear-history command. The -n after bind makes it so you don't have to issue the tmux command prefix (ctrl-b by default). I use bash, so ctrl-l already does t...
Rename Pandas DataFrame Index
I've a csv file without header, with a DateTime index. I want to rename the index and column name, but with df.rename() only the column name is renamed. Bug? I'm on version 0.12.0
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What is a daemon thread in Java?
...s up to four daemon threads named "Image Fetcher" to fetch images from the file system or network for any thread that needs one.
Daemon threads are typically used to perform services for your application/applet (such as loading the "fiddley bits"). The core difference between user threads and daemo...