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Test if remote TCP port is open from a shell script
...ethod for properly testing if a given TCP port is open on a remote server, from inside a Shell script.
16 Answers
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Bash tool to get nth line from a file
...here's a Bash tool that specifically extracts a line (or a range of lines) from a file.
19 Answers
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What is the difference between the add and offer methods in a Queue in Java?
...added to collection the add method throws an exception and offer doesn't.
From: http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html#add%28E%29
If a collection refuses to add a
particular element for any reason
other than that it already contains
the element, it must throw an...
Property getters and setters
...roperties; such properties do not have storage in the instance - the value from the getter is meant to be computed from other instance properties. In your case, there is no x to be assigned.
Explicitly: "How can I do this without explicit backing ivars". You can't - you'll need something to backu...
How do the Proxy, Decorator, Adapter, and Bridge Patterns differ?
...les of where you see it in the wild? e.g Proxy classes in Web Services. +1 from me.
– Rob Cooper
Dec 8 '08 at 19:06
5
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What is the difference between the mouseover and mouseenter events?
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You can try out the following example from the jQuery doc page. It's a nice little, interactive demo that makes it very clear and you can actually see for yourself.
var i = 0;
$("div.overout")
.mouseover(function() {
i += 1;
$(this).find("span"...
Rolling median algorithm in C
...plement a rolling median filter (analogous to a rolling mean filter) in C. From my search of the literature, there appear to be two reasonably efficient ways to do it. The first is to sort the initial window of values, then perform a binary search to insert the new value and remove the existing one ...
How do I find which rpm package supplies a file I'm looking for?
...NU versions of grep pattern matching utilities.
Repo : base
Matched from:
Filename : /bin/grep
You may prefer the output and speed of the repoquery tool, available in the yum-utils package.
sudo yum install yum-utils
repoquery --whatprovides '*bin/grep'
grep-0:2.5.1-55.el5.x86_64
grep-0...
What is the difference between a 'closure' and a 'lambda'?
...tion here. Instead of asking random programmers who learned about closures from practice with certain programming languages or other clueless programmers, take a journey to the source (where it all began). And since lambdas and closures come from Lambda Calculus invented by Alonzo Church back in the...
How do I update Ruby Gems from behind a Proxy (ISA-NTLM)
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I wasn't able to get mine working from the command-line switch but I have been able to do it just by setting my HTTP_PROXY environment variable. (Note that case seems to be important). I have a batch file that has a line like this in it:
SET HTTP_PROXY=http:...