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How to keep environment variables when using sudo
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I have tested this answer for a package under some myPath added to PATH in the .bashrc file (with export clausule). Then sudo PATH=$PATH which package finds the right answer, unlike sudo which package. However, sudo PATH=$PATH packa...
How can I check if a directory exists in a Bash shell script?
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Instead of testing for both the directory (-d) and the symlink (-L), it's easier just to append a slash to the variable, like if [ -d "${THING:+$THING/}" ]. A directory won't mind the extra slash. A file will evaluate to false. Empty wi...
How to check for null in Twig?
...efined %}
{# do something #}
{% endif %}
Additionally the is sameas test, which does a type strict comparison of two values, might be of interest for checking values other than null (like false):
{% if var is sameas(false) %}
{# do something %}
{% endif %}
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facebook: permanent Page Access Token?
...he access_token field should have your permanent access token. Copy it and test it in the Access Token Debugger. Under "Expires" it should say "Never".
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What is an undefined reference/unresolved external symbol error and how do I fix it?
...urned 1 exit status
and similar errors with Microsoft Visual Studio:
1>test2.obj : error LNK2001: unresolved external symbol "void __cdecl foo(void)" (?foo@@YAXXZ)
1>test2.obj : error LNK2001: unresolved external symbol "int x" (?x@@3HA)
1>test2.obj : error LNK2001: unresolved external sym...
Creating multiline strings in JavaScript
... the performance loss for an application is often negligible. As that perf test shows, even IE7 can do tens of thousands of operations per second.
– Benjamin Atkin
Aug 20 '11 at 8:16
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how to remove X-Powered-By in ExpressJS [duplicate]
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I just tested app.disable('custom1'); And it worked fine (it removed the header from server response). But then I commented out app.disable('custom1'); and the header appears again... Is this normal? I do no longer have the res.head...
How do I partially update an object in MongoDB so the new object will overlay / merge with the exist
...operties of those objects.
Given the object you specified above:
> db.test.insert({"id": "test_object", "some_key": {"param1": "val1", "param2": "val2", "param3": "val3"}})
WriteResult({ "nInserted" : 1 })
We can update just some_key.param2 and some_key.param3:
> db.test.findAndModify({
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How to implode array with key and value without foreach in PHP
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I spent measurements (100000 iterations), what fastest way to glue an associative array?
Objective: To obtain a line of 1,000 items, in this format: "key:value,key2:value2"
We have array (for example):
$array = [
'test0' => 344,
'test1' => 235,
'test2' =...
Get the name of the currently executing method
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Even better than my first answer you can use __method__:
class Foo
def test_method
__method__
end
end
This returns a symbol – for example, :test_method. To return the method name as a string, call __method__.to_s instead.
Note: This requires Ruby 1.8.7.
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