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Difference between Arrays.asList(array) and new ArrayList(Arrays.asList(array))
... which makes the original array available as a list. Nothing is copied and all, only a single wrapper object is created. Operations on the list wrapper are propagated to the original array. This means that if you shuffle the list wrapper, the original array is shuffled as well, if you overwrite an e...
How do I use shell variables in an awk script?
...o it becomes a part of it.
If you want to make an awk that changes dynamically with use of variables, you can do it this way, but DO NOT use it for normal variables.
variable="line one\nline two"
awk 'BEGIN {print "'"$variable"'"}'
line one
line two
Here is an example of code injection:
variabl...
Match linebreaks - \n or \r\n?
... had to match exclusively on linebreaks instead of using the s -flag ( dotall - dot matches linebreaks).
5 Answers
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How to reload apache configuration for a site without restarting apache
I have edited the variable AllowOverride for one of my websites in sites-enabled directory. How do I reload the new configuration without restarting apache? Is it possible?
...
'AND' vs '&&' as operator
...
If you use AND and OR, you'll eventually get tripped up by something like this:
$this_one = true;
$that = false;
$truthiness = $this_one and $that;
Want to guess what $truthiness equals?
If you said false... bzzzt, sorry, wrong!
$truthiness above has the ...
What does Class mean in Java?
...nt which type is Class<?>, So Class<?> is more convenient for all situation.
– petertc
Oct 5 '18 at 7:08
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show 1 more comment
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What does “javascript:void(0)” mean?
...rator is often used merely
to obtain the undefined primitive
value, usually using “void(0)” (which
is equivalent to “void 0”). In these
cases, the global variable undefined
can be used instead (assuming it has
not been assigned to a non-default
value).
An explanation is provi...
Parallel.ForEach vs Task.Factory.StartNew
...
The first is a much better option.
Parallel.ForEach, internally, uses a Partitioner<T> to distribute your collection into work items. It will not do one task per item, but rather batch this to lower the overhead involved.
The second option will schedule a...
How to implement a confirmation (yes/no) DialogPreference?
...t.
new AlertDialog.Builder(this)
.setTitle("Title")
.setMessage("Do you really want to whatever?")
.setIcon(android.R.drawable.ic_dialog_alert)
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
...
Command to get nth line of STDOUT
...ssage:
ls -l | sed -n -e '2{p;q}'
I've seen that often enough that I usually use the first (which is easier to type, anyway), though ls is not a command that complains when it gets SIGPIPE.
For a range of lines:
ls -l | sed -n 2,4p
For several ranges of lines:
ls -l | sed -n -e 2,4p -e 20,30...