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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 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 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 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...
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...
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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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 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...