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How does the bitwise complement operator (~ tilde) work?
...ng the binary representation of a number, taking its complement (inverting all the bits) and adding one. Two starts as 0000 0010, and by inverting the bits we get 1111 1101. Adding one gets us the result above. The first bit is the sign bit, implying a negative.
So let's take a look at how we get ~2...
Removing multiple classes (jQuery)
...
The documentation says:
class (Optional) String
One or more CSS classes to remove from the elements, these are separated by spaces.
Example:
Remove the class 'blue' and 'under' from the matched elements.
$("p:odd").removeClass("blue under");
...
An “and” operator for an “if” statement in Bash
...etter to do:
if ! [ "${STATUS}" -eq 200 ] 2> /dev/null && [ "${STRING}" != "${VALUE}" ]; then
or
if [ "${STATUS}" != 200 ] && [ "${STRING}" != "${VALUE}" ]; then
It's hard to say, since you haven't shown us exactly what is going wrong with your script.
Personal opinion: nev...
Why am I getting error for apple-touch-icon-precomposed.png
...means the configured web document-root directory, e.g. in Apache 2.4 it usually /var/www/htdocs
– Hgehlhausen
Dec 14 '16 at 19:40
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JavaScript check if variable exists (is defined/initialized)
...initialized is better/correct?
(Assuming the variable could hold anything (string, int, object, function, etc.))
28 Answers...
Use PHP to create, edit and delete crontab jobs?
... I used exec('crontab -l', $output). Then implode the $output array into a string (with \n as the glue).
– David Fairbanks
Dec 23 '12 at 1:35
1
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How to configure PostgreSQL to accept all incoming connections
I've got a PostgreSQL data base that I'd like to configure to accept all incoming connections regardless of the source IP address. How can this be configured in the pg_hba.conf file? I'm using postgreSQL version 8.4.
...
Linux command to list all available commands and aliases
... Instead of compgen | grep, it can be more efficient to pass the string as argument to compgen itself (if it's known to be a prefix, as implied in the question). In this case, that would be compgen -ac searchstr.
– Toby Speight
Jul 20 '17 at 9:01
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@AspectJ pointcut for all methods of a class with specific annotation
...tMapping(value = "/", method = RequestMethod.GET)
public @ResponseBody String home() {
return "w00t!";
}
}
Annotation on method, app/PagesController.java:
package app;
@Controller
public class PagesController {
@Monitor
@RequestMapping(value = "/", method = RequestMethod.G...
How to estimate how much memory a Pandas' DataFrame will need?
...o stdout. Technically these are kibibytes (KiB), not kilobytes - as the docstring says, "Memory usage is shown in human-readable units (base-2 representation)." So to get bytes would multiply by 1024, e.g. 451.6 KiB = 462,438 bytes.
>>> df.info()
...
memory usage: 70.0+ KB
>>> d...