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Check Whether a User Exists
...so, if you turn this snippet into a function or script, I suggest you also set your exit code appropriately:
#!/bin/bash
user_exists(){ id "$1" &>/dev/null; } # silent, it just sets the exit code
if user_exists "$1"; code=$?; then # use the function, save the code
echo 'user found'
else
...
C++ equivalent of java's instanceof
... does not work for multiple inheritance.
InstanceOfMacros.h
#include <set>
#include <tuple>
#include <typeindex>
#define _EMPTY_BASE_TYPE_DECL() using BaseTypes = std::tuple<>;
#define _BASE_TYPE_DECL(Class, BaseClass) \
using BaseTypes = decltype(std::tuple_cat(std::tup...
Cropping an UIImage
... CGImage], cropRect);
// or use the UIImage wherever you like
[UIImageView setImage:[UIImage imageWithCGImage:imageRef]];
CGImageRelease(imageRef);
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Simple way to copy or clone a DataRow?
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Python strptime() and timezones?
...n aware datetime object will be produced. The tzinfo of the result will be set to a timezone instance.
Note that this doesn't work with %Z, so the case is important. See the following example:
In [1]: from datetime import datetime
In [2]: start_time = datetime.strptime('2018-04-18-17-04-30-AEST'...
What is the difference between user and kernel modes in operating systems?
...each entry has a field Privl which encodes the ring.
The LGDT instruction sets the address to the current descriptor table.
See also: http://wiki.osdev.org/Global_Descriptor_Table
the segment registers CS, DS, etc., which point to the index of an entry in the GDT.
For example, CS = 0 means the fi...
Passing multiple values to a single PowerShell script parameter
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dyld: Library not loaded … Reason: Image not found
...
@Himanshu I have libcppreset for my project! it has a lot of dependency from boost and ... I run a bash script to change them with install_name_tool but for the LC_ID_DYLIB I can't so need to make a symlink in usr/loca/opt ! is there any way to figur...
将 App Inventor 2 项目连接到外部传感器 · App Inventor 2 中文网
...ment by connecting various blocks of code.
Currently, AppInventor’s toolset primarily focuses on enabling prototyping of software experiences, with many blocks created to utilize Android system services such as sending and receiving SMS messages or reading information from the web. The focus of t...
using jquery $.ajax to call a PHP function
... the corresponding value should point to the method to invoke, e.g.:
if(isset($_POST['action']) && !empty($_POST['action'])) {
$action = $_POST['action'];
switch($action) {
case 'test' : test();break;
case 'blah' : blah();break;
// ...etc...
}
}
I belie...