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What is the best way to ensure only one instance of a Bash script is running? [duplicate]
...in to catch any signals that might kill your script prematurely. Near the top of the script, add something like: trap " [ -f /var/run/my.lock ] && /bin/rm -f /var/run/my.lock" 0 1 2 3 13 15 You can search /usr/bin/* for more examples.
– Shannon Nelson
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Convert blob URL to normal URL
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I get a Not allowed to navigate top frame to data URL: data:text/plain;base64,... error. I get the data, but the window.location it is not allowed...
– loretoparisi
Apr 24 '18 at 14:22
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What is the AppDelegate for and how do I know when to use it?
...w delegate methods or other view handling (except for construction of the top-level view in applicationDidFinishLaunching:) -- this work should be in respective view controller classes.
Many people lump these things into their AppDelegate because they are lazy or they think the AppDelegate contro...
A CORS POST request works from plain JavaScript, but why not with jQuery?
...ol the requested destination...it is NOT an intermediate script. It is the top of our PHP of our requested location. Does that make more sense?
– Will Mason
Jun 26 '11 at 20:40
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Bootstrap 3 breakpoints and media queries
...ts, 768px and up)
@media (min-width: 768px) { ... }
// Large devices (desktops, 992px and up)
@media (min-width: 992px) { ... }
// Extra large devices (large desktops, 1200px and up)
@media (min-width: 1200px) { ... }
Bootstrap 4 provides source CSS in Sass that you can include via Sass Mixins:
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What is the best way to create constants in Objective-C
...ecific and internal to a single class, declare them as static const at the top of the .m file, like so:
static NSString *const MyThingNotificationKey = @"MyThingNotificationKey";
If they pertain to a single class but should be public/used by other classes, declare them as extern in the header and...
How to implement common bash idioms in Python? [closed]
...kish workarounds implanted in the OS. The novelty of microtools (awk, sed, top, base, etc) wore off the day everybody decided to roll their own version. I cringe when I imagine the amount of man-hours wasted on crappy little tools that could easy be replaced by a couple well designed Python modules....
Determine project root from a running node.js application
...l paths of all loaded files. The modules are loaded first, and thus at the top of this registry. By selecting the first element of the registry and returning the path before the 'node_modules' directory we are able to determine the root of the application.
It's just one line of code, but for simpli...
CASCADE DELETE just once
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He has the warning on top. If you choose to ignore that, no one can help you. I think your "copyPaste" users are the real danger here.
– BluE
Sep 7 '18 at 11:26
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Extract elements of list at odd positions
...n for list slicing. Usually it is in the following form:
some_list[start:stop:step]
If we omitted start, the default (0) would be used. So the first element (at position 0, because the indexes are 0-based) would be selected. In this case the second element will be selected.
Because the second el...