When man &lt;cmd&gt; or &lt;cmd&gt; --help or &lt;cmd&gt; -h doesn't show you how to use the command, what should you do to get the information you need?  For example, the command enable has no manual page.   Type enable --invalid_option will only show you the usage enable: usage: enable [-a] [-dnps] [-f filename] [name ...] without any explanation. Since the term enable is too generic, searching online for ubuntu terminal command enable will only give you lots of unwanted results.   So is there a best way to get the manual of a command, when man &lt;cmd&gt; doesn't work?
I'm running Bash scripting, but sometimes I get confused which of these commands I use belong to who. Sometimes man xxx works, sometimes doesn't, so I use --help or info, mostly one of these works to show description of the command. Can anyone tell me how I would know what command belongs to what? Bash builtin, GNU utility, etc.
Is there any good reason that an empty set of round brackets (parentheses) isn't valid for calling the default constructor in C++?  MyObject  object;  // ok - default ctor MyObject  object(blah); // ok  MyObject  object();  // error   I seem to type "()" automatically everytime. Is there a good reason this isn't allowed? I'm a quarter Draconian, a quarter Dragonborn and half Half-Dragon? What are the differences between "Dragonborn", "Half-Dragon", and "Draconian" races in D&amp;D?  In the Hoard of the Dragon Queen adventure, for example there is  a Half-Dragon npc. I had assumed that when writing the adventure they were only allowed to use known material from Basic, and so renamed the Dragonborn into "Half-Dragon" for the sake of compatibility etc. However, the dragon breath rules are not at all similar for the half-dragon and the dragonborn, and I've also noticed wiki article that imply that they are different races entirely. (Thus introducing me to the term Draconian)  Are there clear differences between these three races, (in the same way there are differences between Goblins and Hobgoblins, or Dragonborn and Lizardfolk and Kobolds,) or are they really just three different setting names for the same basic race?  Answers can either be D&amp;D 5e specific, or be based on the lore from all editions of Dungeons and Dragons. (I'm assuming here that the answer will be the same regardless)  Here are two images, the first one is a "half-dragon" from the front of the Hoard of the Dragon queen module, and the second one is a "dragonborn" from the 5e player's Handbook.  I've included these images to help explain my confusion. Implementing a PIVOT query Why do networks need a common ground cable? How to delete column/field in PyQGIS? How to set BibTeX bibliography title? Currently my bibliography says "Literatur" (german). But I want something completely different there. How can I achieve that? php String Concatenation, Performance In languages like Java and C#, strings are immutable and it can be computationally expensive to build a string one character at a time.  In said languages, there are library classes to reduce this cost such as C# System.Text.StringBuilder and Java java.lang.StringBuilder.  Does php (4 or 5; I'm interested in both) share this limitation?  If so, are there similar solutions to the problem available? I get the point of having a minimum reputation to use the new chat feature. However, I was hoping my 2K reputation from Stack Overflow would be enough - but it looks like I need to acquire 20 rep here on Meta Stack Exchange.  So my question is - should this restriction be moved? Note: This is a canonical post created so that we can close the many similar questions as duplicates as discussed in .   We have created a logo for a client and they love it. We've already started preparing the materials that will feature the new logo.   However, after we had created the logo, we found a logo for another company that looks eerily similar. We did not intentionally create the new logo to look like the one of the other company, in fact we didn't even know it existed beforehand, but it does regardless.  What should we do? Is this plagiarism? Can our client use the logo we have created? Should they? Or do we need to come up with another logo that's more different? Working with a huge file. Illustrator is super slow. What can I do to ease the load? The size of the file is 168mb and it's nearly impossible to work on the file because every action takes like five minutes or so to complete. The artwork is of a scene filled with characters and I so far outlined the entire thing with a brush and afterwards expanded all the strokes thinking it would help ease the load. However, the file is still way too big. Is there something I can do to make it easier to work on the file?  Edit: I flattened transparency and got it reduced to 33mb. Huge difference, but would like it even smaller if possible. Should smilies be turned into images in questions and answers? A lot of mention has been made of the seriousness of Stack Overflow (and presumably Server Fault). Would it be a good idea to turn  :-) into actual images as per  in questions and answers? Does the Sun produce audible sound? Parameter Sniffing (or Spoofing) in SQL Server A while ago I had a query that I ran quite a lot for one of my users. It was still being evolved and tweaked but eventually it stablised and ran quite quickly, so we created a stored procedure from it.   So far, so normal.   The stored procedure, though, was dog slow. No material difference between the query and the proc, but the speed change was massive.   [Background, we're running SQL Server 2005.]  A friendly local DBA (who no longer works here) took one look at the stored procedure and said "parameter spoofing!" (Edit: although it seems that it is possibly also known as 'parameter sniffing', which might explain the paucity of Google hits when I tried to search it out.)   We abstracted some of the stored procedure to a second one, wrapped the call to this new inner proc into the pre-existing outer one, called the outer one and, hey presto, it was as quick as the original query.   So, what gives? Can someone explain parameter spoofing?   Bonus credit for    highlighting how to avoid it  suggesting how to recognise possible cause discuss alternative strategies, e.g. stats, indices, keys, for mitigating the situation Could a website force the browser to go into fullscreen mode? When clicking between "Week", "Month", "Quarter", "Year" and "All" on the users page, the name I have typed in to filter on disappears. I feel like it should stay there, so that I can type in my name, and see how I've done in a week/month/etc. Show that the series $$\sum\limits_{n=2}^{\infty} \frac {(n^3+1)^{1/3}-n}{\log n}$$ converges.   I showed it using Abel's theorem and limit comparison test. Any other simpler method? Is my baby's gender an example of Schrodinger's cat? How do I lerp between values that loop (such as hue or rotation)? I'm trying to make the joint rotate smoothly around the center of the canvas, toward the angle of mouse pointer. What I have works, but I want it to animate the shortest distance possible to get to the mouse angle. The problem occurs when the value loops around at the horizontal line (3.14 and -3.14). Mouseover that area to see how the direction switches and it takes the long way back around.  Relevant Code   // ease the current angle to the target angle joint.angle += ( joint.targetAngle - joint.angle ) * 0.1;  // get angle from joint to mouse var dx = e.clientX - joint.x,     dy = e.clientY - joint.y;   joint.targetAngle = Math.atan2( dy, dx );   How can I make it rotate the shortest distance, even "across the gap"? I can follow the proofs in which the asymptotic normal-distribution of a maximum likelihood estimator $\tilde{\theta}_n$ is derived.   however, does this already imply that the maximum likelihood estimates are asymptotically unbiased, i.e. do we have $$E(\tilde{\theta}_n) \to \theta \text{ as } n \to \infty?$$  Since I am aware that in general it is not true that convergence in distribution implies convergence in moments, an explanation would be nice.  The result is often stated e.g.  as "...it means that the bias of the maximum likelihood estimator is equal to zero up to the order $n^{-1/2}$")  1.) Are  some kind of regularity conditions from the mle theory used to establish this result?  2.) Or is a $\sqrt{n}$-convergence of an estimator (to a normal distribution) in general already enough to establish convergence of its moments?  Note: the Wikipedia article mentions Cox, David R.; Snell, E. Joyce (1968).  , as a source where the order of the bias is derived (formula (12) or (20)).   However in this paper I can't follow the arguments 100%, since their Taylor approximation of $L'(\widehat{\beta})$ is lacking the remainder term. What is the argument used here to discard it completely? When rolling percentages, do 1d100 and two d10s (percentiles) share the same probabilities?