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What does `kill -0 $pid` in a shell script do?
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sending the signal 0 to a given PID just checks if any process with the given PID is running and you have the permission to send a signal to it.
For more information see the following manpages:
kill(1)
$ man 1 kill
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If sig is 0, then no signal is sent,...
Type definition in object literal in TypeScript
...as much as possible and then compose the object as the final step:
const id = GetId();
const hasStarted = true;
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const hasFinished = false;
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return {hasStarted, hasFinished, id};
This will properly type everything without any need for explicit typing.
There is no need to retype the field...
Should I use pt or px?
... PX, PT, CM, IN…, about how px is a "magical" unit invented for CSS. The meaning of px varies by hardware and resolution. (That article is fresh, last updated 2014-10.)
My own way of thinking about it: 1 px is the size of a thin line intended by a designer to be barely visible.
To quote that arti...
Password hint font in Android
...seems that the hint is shown in a different font (courrier?). How can I avoid this? I would like the hint to appear in the same font that when the EditText is not in password mode.
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What is the difference between ng-if and ng-show/ng-hide
...ise had a large dom. It seemed to make the page feel quicker, but is by no means scientific analysis.
– Ed Spencer
Mar 24 '14 at 10:33
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How do I find the authoritative name-server for a domain name?
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What does it mean if there is no authoritative answer but the non-authoritative answer is fine ?
– Overmind
Jul 5 '17 at 9:31
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How do you delete an ActiveRecord object?
...ns and delete_all with conditions has been deprecated in Rails 5.1 - see guides.rubyonrails.org/5_1_release_notes.html
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Accessing an SQLite Database in Swift
... the sqlite3_open documentation makes it explicit that we must do so to avoid leaking memory:
Whether or not an error occurs when it is opened, resources associated with the database connection handle should be released by passing it to sqlite3_close() when it is no longer required.
Use sqlite3...
Why don't self-closing script elements work?
... <p/> inside the paragraph, due to interpreting squadette's quote to mean that since <p> is non-empty, it can't be self-closing. In XHTML 1.1, it can be self-closing.
– Joe
Jul 28 '11 at 21:07
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Changing Vim indentation behavior by file type
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Yeah. My comment says use a single ", meaning don't close it with another ". Not sure why I commented that though.
– sdkks
Mar 6 '19 at 10:10
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