Imagine I only know a part of the name of the folder(s) or file(s), but don’t know their location(s) in the computer. I even don’t know whether they are hidden or not. How can I search and list them all?  (Say, for example I want to list all the folders and files which are having mysql as the part of their name)
Within a set of directories, how do I find a file whose name includes a given string, such as "abcde"?
Develop rich API exposing Stack Overflow functionality I would love to see an actual native iPhone app for Stack Overflow, Server Fault, Super User, etc.  I've actually developed a number of iPhone apps myself, and would certainly be interested and willing in doing the bulk of the legwork, but it would be necessary for the SO team to expose a real API, instead of simply RSS feeds.  Maybe if there's enough demand behind this, we can convince the SO team to build a rich API, which could be useful for many other applications, not just an iPhone app. Solving an ODE in power series How can I show or hide boot messages when Ubuntu starts? In  related question (), the OP asks if it is grammatical to use the definite article before phrases like Advanced programming in Java whitepaper and Microsoft Office 2010 product. The accepted answer by @Kosmonaut was:     Yes, it is. This is because the "Advanced programming in Java"   whitepaper phrase forms a syntactic unit, with whitepaper as the head   of the unit. The definite article for a phrase always corresponds to   the head of the phrase, so using the definite (or indefinite) article   for these phrases makes perfect sense and is correct English.   My question is whether the same answer applies to phrases like Heathrow Airport, Hyde Park,  Waterloo Station, Edgware Road and Parliament Square. I ask becase it seems to me that airport, park and station, etc. sound like they are part of the proper noun itself, and not simply a common noun. Moreover, I think the head of the unit in these cases would be the place name (first noun) and not the place type (second noun). If that's true, then I assume that no definite article should precede these phrases. Is that correct? How does one parse XML files? How do I switch to first person? Precision of Coulomb's law Up to which precision has the coulomb law proven to be true? I.e.  if you have two electrons in a vacuum chamber, 5 meters appart, have the third order terms been ruled out? Are there any theoretical limits to measure the precision ( Planck's constant?). Obviously there are practical limitations ( imperfect vacuum, cosmic rays, vacuum fluctuation). Still, does anyone know what was the smallest amount ever correctly predicted by that law?    Edit : Summary  On the high end of the energy spectrum a precision of 10^-16 has been shown ( 42 years ago )  For electron point charges at large distances the law might brake down due to practical reasons.  For moving particles QED gives a correction to the law: Does the potential energy of a single object exist? I know that potential energy exists for a system of objects. But why? Is there no potential energy for a single object system? I assume that there is.  Consider the earth-object system. Suppose an external force lifts the object above the earth. Then the work done by it gets stored in the earth-object system as potential energy.Right?  Now, my question is that is the potential energy always zero for a single object system.   MY REASONING  If we consider the object only as the system and lift it above the Earth, we are doing positive work on it and filling it with energy and the gravitational field of the Earth is doing negative work on it and draining it of energy. Thus whenever the object is moving it has kinetic energy which is fine. But when it is not moving,i.e. when its weight is equal to the force applied by us, the net work done is zero and so the object should not have any kinetic energy. Does it have potential energy? Which rational numbers can be written as the sum of two rational squares?  That is, for which rational numbers $a$, are there rational numbers $x$ and $y$ such that $a = x^2 + y^2$.  It is a famous theorem that if an integer can be written as the sum of two rational squares then it can be written as the sum of two integral squares, and then the solution is the famous one by Fermat, but I didn't find anything about the general case. Alignment of equals sign in multiple align environments How can I write SQL for a table that shares the same name as a protected keyword in MySql? In Illustrator is there a way to precisely scale to a pivot point or "reference point" that is off the screen? I mean when you want to zoom in somewhere far away from where you set that point and then scale precisely to align something.   Here's :     To scale relative to a different reference point , click where you   want the reference point to be in the document window, move the   pointer away from the reference point, and then drag until the object   is the desired size.   Well, I tried using this click-drag scaling method as well, but the level of precision is too low to be usable. It overshoots or undershoots the guide I'm aiming for.  The Scale tool's pop-up dialog isn't useful either. It only offers percentages. And moving/zooming are disabled while the dialog window is up, meaning I cannot navigate to the guide I need to see.  For these reasons, I need to be zoomed in on the guide, tweaking the measurements from the top Control Panel.  Some images to help illustrate what I mean:    ▲ The circle marks where I would like the center of my scale transformation to be.    ▲ Now zoomed in somewhere else, I am trying to get the black border of this bitmap image to align perfectly with the vector guide by scaling it.    ▲ I nudge the numbers in the Control Panel until the image is perfectly aligned.  One would think all would be perfect, but then I look and my reference point has vanished!   It seems the scaling has been executed relative to one of these limited nine reference point choices  instead of the reference point I specified.  There must be a way to scale precisely to a specific reference point in illustrator. Can somebody please enlighten me? Evaluate the limit: $$\mathop {\lim }\limits_{x \to \infty } x\left( {{{\left( {1 + {1 \over x}} \right)}^x} - e} \right)$$  My attempts didn't yield a result. I'd be glad for a guidance. Thanks! Fast way to find period-n points of a tent map? I need to find a period-3 orbit for a tent map defined by $$T(x)=\begin{cases}2x &amp; 0\le x\le0.5 \\[2ex] 2-2x &amp;0.5 &lt; x \le 1 \end{cases}$$  So, what is a fast and efficient way of finding it? I only know how to do it by guessing-and-checking. For example, I picked a random point, $x = \frac{2}{7}$ and found that $$T\left(\frac{2}{7}\right)=\frac{4}{7}\\[4ex]T\left(\frac{4}{7}\right)=\frac{6}{7}\\[4ex]T\left(\frac{6}{7}\right)=\frac{2}{7}$$ which is a period-3 orbit. Is there any better way of finding a period-3 orbit , more specifically, a period-3 point? What if 'kill -9' does not work? I have a process I can't kill with kill -9 &lt;pid&gt;. What's the problem in such a case, especially since I am the owner of that process. I thought nothing could evade that kill option. How do I redirect to another webpage? How can I redirect the user from one page to another using jQuery or pure JavaScript? Fundamental Theorem of Algebra - an elementary complex analysis proof? We begin by assuming that a non-constant complex polynomial $$p(z)=a_n z^n+a_{n-1}z^{n-1}+...+a_1 z+a_0,$$ where $a_0 \neq 0$, doesn't vanish in $\mathbb{C}$. Therefore $1/p$ is also an analytical function everywhere. Note that $(p(z)-a_0)/z$ is a polynomial and therefore, due to Cauchy's theorem, the following integral must be zero.  $$\int_{S_r^1}\frac{(p(z)-a_0)/z}{p(z)}dz=\int_{S_r^1}\frac{a_nz^{n-1}+a_{n-1}z^{n-2}+...+a_1}{a_nz^n+a_{n-1}z^{n-1}+...+a_1 z+a_0}dz=0.$$  On the other hand  $$\int_{S_r^1}\frac{a_nz^{n-1}+a_{n-1}z^{n-2}+...+a_1}{a_nz^n+a_{n-1}z^{n-1}+...+a_1 z+a_0}dz$$  $$=\int_{0}^{2\pi}\frac{a_n(re^{i\theta})^{n-1}+a_{n-1}(re^{i\theta})^{n-2}+...+a_1}{a_n(re^{\theta})^n+a_{n-1}(re^{i\theta})^{n-1}+...+a_1 (re^{i\theta})+a_0}(ire^{i\theta})d\theta$$  $$=\int_{0}^{2\pi}i d\theta - \int_{0}^{2\pi}\frac{a_0 i}{a_n(re^{i\theta})^n+a_{n-1}(re^{i\theta})^{n-1}+...+a_1 (re^{i\theta})+a_0}d\theta$$ $$=2\pi i -\int_{0}^{2\pi}\frac{a_0i}{p(re^{i\theta})}d\theta.$$  Let $r \rightarrow \infty$ and the integral approaches value $2\pi i$ - a contradiction. Therefore $1/p$ can't be entire and $p$ must vanish somewhere in the complex plane.  EDIT: I have changed this post and deleted the idea that the integral $\int_{\partial D_r}\frac{(p(z)-a_0)/z}{p(z)}dz=0$ could be evaluated with the fundamental theorem of calculus. Now, as it stands, this proof is essentially the same as the one that Mr. José Carlos Santos points out in his comment. Unable to correctly install pip3 using apt-get I am using Ubuntu 16.04, and was experiencing issues with my pip3. Specifically, when I attempted to uninstall a package via  sudo pip3 uninstall   I encountered   Traceback (most recent call last):   File "/usr/bin/pip3", line 9, in &lt;module&gt;     from pip import main ImportError: cannot import name 'main'   I attempted to resolve this issue by reinstalling pip3, specifically   sudo python3 -m pip uninstall pip &amp;&amp; sudo apt install python3-pip --reinstall   which succeeded. However, I no longer have a local version of pip3 at all  bash: /home/kurt/.local/bin/pip3: No such file or directory   Using which pip3 in a new terminal I find,  $ which pip3 /usr/bin/pip3   and attempting to use pip3 at all brings me  $ pip3 Traceback (most recent call last): File "/usr/lib/python3/dist-packages/pip/_vendor/__init__.py", line 33, in vendored     __import__(vendored_name, globals(), locals(), level=0) ImportError: No module named 'pip._vendor.pkg_resources'  During handling of the above exception, another exception occurred:  Traceback (most recent call last): File "/usr/bin/pip3", line 9, in &lt;module&gt;     from pip import main File "/usr/lib/python3/dist-packages/pip/__init__.py", line 13, in &lt;module&gt;     from pip.exceptions import InstallationError, CommandError, PipError File "/usr/lib/python3/dist-packages/pip/exceptions.py", line 6, in &lt;module&gt;     from pip._vendor.six import iteritems File "/usr/lib/python3/dist-packages/pip/_vendor/__init__.py", line 75, in &lt;module&gt;     vendored("pkg_resources") File "/usr/lib/python3/dist-packages/pip/_vendor/__init__.py", line 36, in vendored     __import__(modulename, globals(), locals(), level=0) File "&lt;frozen importlib._bootstrap&gt;", line 969, in _find_and_load File "&lt;frozen importlib._bootstrap&gt;", line 958, in _find_and_load_unlocked File "&lt;frozen importlib._bootstrap&gt;", line 664, in _load_unlocked File "&lt;frozen importlib._bootstrap&gt;", line 634, in _load_backward_compatible File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2927, in &lt;module&gt; File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2913, in _call_aside File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2952, in _initialize_master_working_set File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 956, in subscribe File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2952, in &lt;lambda&gt; File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2515, in activate File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2097, in declare_namespace File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2047, in _handle_ns File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2066, in _rebuild_mod_path AttributeError: '_NamespacePath' object has no attribute 'sort'   However, I am able to execute without incident when typing sudo -H pip3 -v. Reinstalling pip3 from apt, e.g.  sudo apt-get install python3-pip --reinstall   has no effect. If anyone has any insight, or has encountered a similar problem, I would greatly appreciate any input on how to approach this problem. I have a .tiff and a .tfw file that I want to change into a GeoTIFF. When I try to open the file in ArcMap and ENVI 5.0, it is successful. However, in Google Earth it is not.  Is there anyway to create the GeoTiff in ArcMap or ENVI? Split seeds.rb into multiple sections?