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Why is $$ returning the same id as the parent process?
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$$ is defined to return the process ID of the parent in a subshell; from the man page under "Special Parameters":
$ Expands to the process ID of the shell. In a () subshell, it expands to the process ID of the current shell, not the subshell.
In bash 4, you can get the process ID...
Difference between static and shared libraries?
...me. A program using a static library takes copies of the code that it uses from the static library and makes it part of the program. [Windows also has .lib files which are used to reference .dll files, but they act the same way as the first one].
There are advantages and disadvantages in each metho...
HTTP GET Request in Node.js Express
How can I make an HTTP request from within Node.js or Express.js? I need to connect to another service. I am hoping the call is asynchronous and that the callback contains the remote server's response.
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How do you do a ‘Pause’ with PowerShell 2.0?
...is a composite of <1> above with the ISE workaround/kludge extracted from the proposal on Adam's Tech Blog (courtesy of Nick from earlier comments on this page). I made two slight improvements to the latter: added Test-Path to avoid an error if you use Set-StrictMode (you do, don't you?!) and ...
Most efficient way to make the first character of a String lower case?
...y if and only if the string is in ASCII. This was the fastest. c[0] |= ' ' from Mike's comment gave the same performance.
char c[] = string.toCharArray();
c[0] += 32;
string = new String(c);
test4 used StringBuilder.
StringBuilder sb = new StringBuilder(string);
sb.setCharAt(0, Character.toLowerC...
Why is debugging better in an IDE? [closed]
...pplications, which can be difficult to achieve with tracing (as the traces from different threads will be interleaved in the output).
In summary, print statements are (generally) static and you'll need to re-compile to get additional information if your original statements weren't detailed enough....
Typedef function pointer?
...sion about the entanglement of the alias and name. I learned something new from reading this post.
– Mad Physicist
Apr 7 '15 at 20:51
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django MultiValueDictKeyError error, how do I deal with it
... is_private = request.POST['is_private']
else:
is_private = False
3
from django.utils.datastructures import MultiValueDictKeyError
try:
is_private = request.POST['is_private']
except MultiValueDictKeyError:
is_private = False
...
Templated check for the existence of a class member function?
...st thing, I use expression SFINAE to exclude the serialize(_imp) functions from overload resolution, if the first expression inside decltype isn't valid (aka, the function doesn't exist).
The void() is used to make the return type of all those functions void.
The 0 argument is used to prefer the o...
Check if PHP session has already started
I have a PHP file that is sometimes called from a page that has started a session and sometimes from a page that doesn't have session started. Therefore when I have session_start() on this script I sometimes get the error message for "session already started". For that I've put these lines:
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