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Passing additional variables from command line to make
...ment operator, it only has an effect if the variable is not yet defined):
FOO?=default_value_if_not_set_in_environment
Note that certain variables are not inherited from environment:
MAKE is gotten from name of the script
SHELL is either set within a makefile, or defaults to /bin/sh (rationale:...
How to determine function name from inside a function
... contains all other functions in the call stack. For example:
# in a file "foobar"
function foo {
echo foo
echo "In function $FUNCNAME: FUNCNAME=${FUNCNAME[*]}" >&2
}
function foobar {
echo "$(foo)bar"
echo "In function $FUNCNAME: FUNCNAME=${FUNCNAME[*]}" >&2
}
foobar...
What is the best way to filter a Java Collection?
...dable) way is to iterate it and use Iterator.remove() method:
Iterator<Foo> it = col.iterator();
while( it.hasNext() ) {
Foo foo = it.next();
if( !condition(foo) ) it.remove();
}
Now, to make it more readable, you can wrap it into a utility method. Then invent a IPredicate interface, cr...
What is the difference between client-side and server-side programming?
...le code executes like this:
<script type="text/javascript">
var foo = 'bar';
<?php
file_put_contents('foo.txt', ' + foo + ');
?>
var baz = <?php echo 42; ?>;
alert(baz);
</script>
Step 1, PHP executes all code between <?php ?> tags. The r...
What is the reason behind “non-static method cannot be referenced from a static context”? [duplicate
...instance fields are the data. Together, they form an object.
public class Foo
{
private String foo;
public Foo(String foo){ this.foo = foo; }
public getFoo(){ return this.foo; }
public static void main(String[] args){
System.out.println( getFoo() );
}
}
What could pos...
What are the differences between JSON and JavaScript object? [duplicate]
...st be quoted, while in object literals this is not necessary:
// JSON:
{ "foo": "bar" }
// Object literal:
var o = { foo: "bar" };
The quotes are mandatory on JSON because in JavaScript (more exactly in ECMAScript 3rd. Edition), the usage of reserved words as property names is disallowed, for ex...
PHP_SELF vs PATH_INFO vs SCRIPT_NAME vs REQUEST_URI
..._SERVER['PHP_SELF'] in a script at the address http://example.com/test.php/foo.bar would be /test.php/foo.bar. The __FILE__ constant contains the full path and filename of the current (i.e. included) file. If PHP is running as a command-line processor this variable contains the script name since PHP...
How can I remove the extension of a filename in a shell script?
...
You can also use parameter expansion:
$ filename=foo.txt
$ echo "${filename%.*}"
foo
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How to use sed/grep to extract text between two words?
...
You can strip strings in Bash alone:
$ foo="Here is a String"
$ foo=${foo##*Here }
$ echo "$foo"
is a String
$ foo=${foo%% String*}
$ echo "$foo"
is a
$
And if you have a GNU grep that includes PCRE, you can use a zero-width assertion:
$ echo "Here is a String"...
Difference between setTimeout with and without quotes and parentheses
...* Look mah! No name! */},2000);
A name of an existing function
function foo(){...}
setTimeout(foo, 2000);
A variable that points to an existing function
var foo = function(){...};
setTimeout(foo, 2000);
Do note that I set "variable in a function" separately from "function name". It's not ap...