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Check if an apt-get package is installed and then install it if it's not on Linux
...kage 'certbot' is not installed and no information is available
the file /etc/logrotate.d/certbot is still present in the system after apt remove, but not after --purge.
However, the file /usr/lib/python3/dist-packages/certbot/reporter.py is still present even after --purge.
I don't understand w...
Get current batchfile directory
... allows you to include redirectors, pipes, special chars (i.e. < > | etc) in that comment.
:: ORIG STMT WAS: dir *.* | find /v "1917" > outfile.txt
Of course, Powershell does this and lots more.
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JavaScript plus sign in front of function expression
...he JIT could use that to compile the function as a numerical-only function etc. However, to prevent the unary plus being a concatenation when used in a larger expression, you would need parentheses:
blah + (+(function(){ var scope; return "4"; })());
...
How to disable the application pool idle time-out in IIS7?
...any setting on a high traffic site you should always test for side effects etc on your staging/QA environment. Also during the time you're applying the change to your production environment then you really ought to throw up a maintenance page for public facing users until such time the change has ta...
import module from string variable
...')
You can thereafter access anything in the module as mymodule.myclass, etc.
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Linux, Why can't I write even though I have group permissions?
...d/gids from its parent. You need a privileged program (such as login, su, etc.) to actually set uid/gids.
– ephemient
Feb 22 '11 at 2:48
4
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Sort Go map values by keys
...ys, k)
}
sort.Strings(keys) # or sort.Ints(keys), sort.Sort(...), etc., per <K>
for _, k := range keys {
v := m[k]
f(k, v)
}
}
Then call it with the input map and a function (taking (k <K>, v <V>) as its input arguments) that is called over the ma...
Passing arguments forward to another javascript function
...null, arguments);
}
function b(){
alert(arguments); //arguments[0] = 1, etc
}
a(1,2,3);
You can test it out here.
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Parse string to DateTime in C#
...ateTime? dt = dtStr.ToDate("yyyy-MM-dd HH:mm");
Unlike Parse, ParseExact etc. it does not throw an exception, and allows you to check via
if (dt.HasValue) { // continue processing } else { // do error handling }
whether the conversion was successful (in this case dt has a value you can access vi...
Why can I create a class named “var”?
... team did this. Same for other later introduced "keywords" like from, join etc (all contextual by the way).
– Abel
May 15 '12 at 17:38
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