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Run cron job only if it isn't already running
...ck your own processes ("ps -u $(whoami) -opid=") and see if you're running one with the same PID ("grep -P "^\s*$(cat ${PIDFILE})$""). If you're not, then it will start the program as before, overwrite the PID file with the new PID, and exit. I see no reason to modify the script; do you?
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What does the 'static' keyword do in a class?
...rs belong to the class instead of a specific instance.
It means that only one instance of a static field exists[1] even if you create a million instances of the class or you don't create any. It will be shared by all instances.
Since static methods also do not belong to a specific instance, they c...
REST API Best practice: How to accept list of parameter values as input [closed]
..."restful" than others. This argument is as ludicrous as saying naming someone "Bob" is better than naming him "Joe" – both names get the job of "identifying a person" done. A URI is nothing more than a universally unique name.
So in REST's eyes arguing about whether ?id=["101404","7267261"] i...
Using PassportJS, how does one pass additional form fields to the local authentication strategy?
...ield: 'email', passReqToCallback: true},
function(req, email, password, done) {
// now you can check req.body.foo
}
));
When, set req becomes the first argument to the verify callback, and you can inspect it as you wish.
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Why is an MD5 hash created by Python different from one created using echo and md5sum in the shell?
A Python MD5 hash is different than the one created by the md5sum command on the shell. Why?
1 Answer
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What is the order of precedence for CSS?
I'm trying to figure out why one of my css classes seems to override the other (and not the other way around)
8 Answers
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Does SQLAlchemy have an equivalent of Django's get_or_create?
...could generalize it ofcourse:
def get_or_create(session, model, defaults=None, **kwargs):
instance = session.query(model).filter_by(**kwargs).first()
if instance:
return instance, False
else:
params = dict((k, v) for k, v in kwargs.iteritems() if not isinstance(v, Clause...
Tools for Generating Mock Data? [closed]
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anyone had success with it's usage? I tried the it, but benerator-wizard generates invalid pom.xml file (for "Populate database" option). Moreover going for one of the demos (hsqldb) with maven results in errors as well. To me i...
Why is “throws Exception” necessary when calling a function?
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In Java, as you may know, exceptions can be categorized into two: One that needs the throws clause or must be handled if you don't specify one and another one that doesn't. Now, see the following figure:
In Java, you can throw anything that extends the Throwable class. However, you don't...
Text editor to open big (giant, huge, large) text files [closed]
...or tail." It's really a log file analyzer, not a large file viewer, and in one test it required 10 seconds and 700 MB of RAM to load a 250 MB file. But its killer features are the columnizer (parse logs that are in CSV, JSONL, etc. and display in a spreadsheet format) and the highlighter (show lines...