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How to check if a process id (PID) exists
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To check for the existence of a process, use
kill -0 $pid
But just as @unwind said, if you're going to kill it anyway, just
kill $pid
or you will have a race condition.
If you want to ignore the text output of kill and do somet...
How do I update Ruby Gems from behind a Proxy (ISA-NTLM)
.../%USER%:%PASSWORD%@%SERVER%:%PORT%
I set the four referenced variables before I get to this line obviously. As an example if my username is "wolfbyte", my password is "secret" and my proxy is called "pigsy" and operates on port 8080:
SET HTTP_PROXY=http://wolfbyte:secret@pigsy:8080
You might wa...
How to check if a number is a power of 2
Today I needed a simple algorithm for checking if a number is a power of 2.
25 Answers
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Split string on the first white space occurrence
... not tabs or other whitespace characters) and only care about everything before the first space and everything after the first space, you can do it without a regular expression like this:
str.substr(0,str.indexOf(' ')); // "72"
str.substr(str.indexOf(' ')+1); // "tocirah sneab"
Note that if there...
How do you default a new class to public when creating it in Visual Studio?
... just by editing a single file (no unzipping or rezipping).
UPDATE: Don't forget to open your preferred text editor with admin privileges before you do any edit.
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Unicode equivalents for \w and \b in Java regular expressions?
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Source code
The source code for the rewriting functions I discuss below is available here.
Update in Java 7
Sun’s updated Pattern class for JDK7 has a marvelous new flag, UNICODE_CHARACTER_CLASS, which makes everything work right again. It’s avail...
Avoiding memory leaks with Scalaz 7 zipWithIndex/group enumeratees
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This will come as little consolation for anyone who's stuck with the older iteratee API, but I recently verified that an equivalent test passes against the scalaz-stream API. This is a newer stream processing API that is intended to replace iteratee.
For comple...
What is the difference between map and flatMap and a good use case for each?
...n to me the difference between map and flatMap and what is a good use case for each?
16 Answers
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Is there a “do … until” in Python? [duplicate]
...isn't in Python is because they found no sane way to incorporate it in the forcefully-indented syntax (at least functional languages compensate this with tail-recursion).
– Miloslav Raus
Aug 7 '17 at 20:47
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Best approach for designing F# libraries for use from both F# and C#
I am trying to design a library in F#. The library should be friendly for use from both F# and C# .
4 Answers
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