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how to use sed, awk, or gawk to print only what is matched?
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My sed (Mac OS X) didn't work with +. I tried * instead and I added p tag for printing match:
sed -n 's/^.*abc\([0-9]*\)xyz.*$/\1/p' example.txt
For matching at least one numeric character without +, I would use:
sed -n 's/^.*abc\([0-9][0-9]*\)xyz.*$/\1/p' example.txt
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C char array initialization
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This is not how you initialize an array, but for:
The first declaration:
char buf[10] = "";
is equivalent to
char buf[10] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
The second declaration:
char buf[10] = " ";
is equivalent to
char buf[10] = {' ', 0, 0, 0, 0, 0, 0, 0, ...
Too many 'if' statements?
...t to, but it's ugly, excessive or a number of other things. I've looked at formulas and attempted to write a few solutions, but I end up with a similar amount of statements.
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How do I break out of nested loops in Java?
...e requirements in the question can be met.
You can use break with a label for the outer loop. For example:
public class Test {
public static void main(String[] args) {
outerloop:
for (int i=0; i < 5; i++) {
for (int j=0; j < 5; j++) {
if (i * j...
How to get a pixel's x,y coordinate color from an image?
...lData is a four entry array containing the pixel's R, G, B, and A values. For alpha, anything less than 255 represents some level of transparency with 0 being fully transparent.
Here is a jsFiddle example: http://jsfiddle.net/thirtydot/9SEMf/869/ I used jQuery for convenience in all of this, but ...
How to linebreak an svg text within javascript?
...pan>s, each with x="0" and dy="1.4em" to simulate actual lines of text. For example:
<g transform="translate(123 456)"><!-- replace with your target upper left corner coordinates -->
<text x="0" y="0">
<tspan x="0" dy="1.2em">very long text</tspan>
<tsp...
Determine the path of the executing BASH script [duplicate]
...mine the directory path of the currently executing script using %~dp0 . For example:
5 Answers
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Seeding the random number generator in Javascript
...xisting one. Check out: this related question.
Also, see David Bau's blog for more information on seeding.
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css transform, jagged edges in chrome
I've been using CSS3 transform to rotate images and textboxes with borders in my website.
11 Answers
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Can you set a border opacity in CSS?
Is there a straight forward CSS way to make the border of an element semi-transparent with something like this?
9 Answers
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