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Test if a variable is set in bash when using “set -o nounset”
...
#!/bin/bash
set -o nounset
VALUE=${WHATEVER:-}
if [ ! -z ${VALUE} ];
then echo "yo"
fi
echo "whatever"
In this case, VALUE ends up being an empty string if WHATEVER is not set. We're using the {parameter:-word} expansion, which you can look up in man bash under "Param...
How do I turn a String into a InputStreamReader in java?
...pending on the default platform encoding and characters in the string. Specifying a Unicode encoding for both encoding and decoding operations would be better. Read this for more details: illegalargumentexception.blogspot.com/2009/05/…
– McDowell
Aug 11 '09 a...
How can I append a string to an existing field in MySQL?
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Just in case somebody runs into the same issue as I did: If the field code is NULL by default you need to use: UPDATE categories SET code = CONCAT(IFNULL(code,''), '_standard') WHERE id = 1; Otherwise the concat will always result in NULL.
– Kai Noack
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Accessing Object Memory Address
...ch is guaranteed to be unique and
constant for this object during its
lifetime. Two objects with
non-overlapping lifetimes may have the
same id() value. (Implementation note:
this is the address of the object.)
So in CPython, this will be the address of the object. No such guarantee for ...
How to get the selected index of a RadioGroup in Android
...Id(radioButtonID);
int idx = radioButtonGroup.indexOfChild(radioButton);
If the RadioGroup contains other Views (like a TextView) then the indexOfChild() method will return wrong index.
To get the selected RadioButton text on the RadioGroup:
RadioButton r = (RadioButton) radioButtonGroup.getChi...
Can functions be passed as parameters?
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If I understand your question correctly, I think you're looking for a func that returns a func, see here where I replace a hardcoded "quote123" function with a "quote" function that achieves the same result after you pass it ...
How to convert xml into array in php?
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Converting an XML string ($buffer) into a simplified array ignoring attributes and grouping child-elements with the same names:
function XML2Array(SimpleXMLElement $parent)
{
$array = array();
foreach ($parent as $name => $element) {
($node = & $a...
How can I tell who forked my repository on GitHub?
... what I see at that link: i.stack.imgur.com/C9arQ.png (and many many more, if you scroll down)
– Matt Ball
Jun 7 '15 at 3:40
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When is assembly faster than C?
...(float only has 23 bit and it's harder to predict precision loss). i.e. uniform absolute precision over the entire range, instead of close-to-uniform relative precision (float).
Modern compilers optimize this fixed-point example nicely, so for more modern examples that still need compiler-specif...
How to display line numbers in 'less' (GNU)
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is it possible to display the line numbers in a different color?
– greg
Jul 2 '13 at 8:24
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