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Subtract two variables in Bash
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You just need a little extra whitespace around the minus sign, and backticks:
COUNT=`expr $FIRSTV - $SECONDV`
Be aware of the exit status:
The exit status is 0 if EXPRESSION is neither null nor 0, 1 if EXPRESSION is null or 0.
Keep this in min...
How to remove empty cells in UITableView? [duplicate]
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But it adds extra spacing above and below table sections.
– Ben Sinclair
Jan 30 '18 at 21:29
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How to avoid Python/Pandas creating an index in a saved csv?
...er way do to this is specify pd.read_csv(..., index_col=[0], and avoid the extra "drop" call.
– cs95
May 28 '19 at 4:19
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How can I propagate exceptions between threads?
... {
teptr = std::current_exception();
}
}
int main(int argc, char **argv)
{
std::thread mythread(f);
mythread.join();
if (teptr) {
try{
std::rethrow_exception(teptr);
}
catch(const std::exception &ex)
{
std::cerr ...
How to use range-based for() loop with std::map?
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If copy assignment operator of foo and bar is cheap (eg. int, char, pointer etc), you can do the following:
foo f; bar b;
BOOST_FOREACH(boost::tie(f,b),testing)
{
cout << "Foo is " << f << " Bar is " << b;
}
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What is TypeScript and why would I use it in place of JavaScript? [closed]
...lay with this in the TypeScript Playground)
class Greeter {
greeting: string;
constructor (message: string) {
this.greeting = message;
}
greet() {
return "Hello, " + this.greeting;
}
}
And here's the JavaScript it would produce
var Greeter = (function () {
...
Wait until a process ends
...itForExit(1000 * 60 * 5); // Wait up to five minutes.
There are a few extra features in there which you might find useful...
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How to set tbody height with overflow scroll
... </tr>
<tr>
<td>February. An extra long string.</td>
<td>AAA</td>
<td><span>Invite | Delete</span></td>
</tr>
<tr>
<td>March</td>
<td>AAA</t...
What does the Reflect object do in JavaScript?
...r property update. For instance:
var name = ... // get property name as a string
obj[name] // generic property lookup
obj[name] = value // generic property update
The Reflect.get and Reflect.set methods allow you to do the same thing, but additionally accept as a last optional argument a receiver...
Is #pragma once part of the C++11 standard?
...ifferent developments, the obvious solution is
to generate a lot of random characters for the include guard
when you create it. (A good editor can be set up to do this for
you whenever you open a new header.) But even without this,
I've yet to encounter any problems with conflicts between
librarie...