ls command shows the following :  a  code  controller.js  mani  sparat  this  ubuntu.gif   l command the shows similar to that :  a/  code/  controller.js  mani/  sparat/  this/  ubuntu.gif   What is difference between them ?
So, through typing several commands I've found that there's not only ls, but l and la too. There doesn't appear to be any man entries on Ubuntu 12.14. They all appear to do similar things with minor differences:  $ ls app        config     CONTRIBUTING.md  doc       Gemfile       Guardfile  LICENSE  MAINTENANCE.md  Procfile  Rakefile   script  tmp     VERSION CHANGELOG  config.ru  db               features  Gemfile.lock  lib        log      PROCESS.md      public    README.md  spec    vendor $ la app      CHANGELOG  config.ru        db   features  Gemfile       .git        Guardfile  LICENSE  MAINTENANCE.md  Procfile  Rakefile   .rspec  .secret     spec  .travis.yml  VERSION .bundle  config     CONTRIBUTING.md  doc  .foreman  Gemfile.lock  .gitignore  lib        log      PROCESS.md      public    README.md  script  .simplecov  tmp   vendor $ l app/       config/    CONTRIBUTING.md  doc/       Gemfile       Guardfile  LICENSE  MAINTENANCE.md  Procfile  Rakefile   script/  tmp/     VERSION CHANGELOG  config.ru  db/              features/  Gemfile.lock  lib/       log/     PROCESS.md      public/   README.md  spec/    vendor/   Just as a bit of trivia, are there more of these and what do they do? Is here any place to find this out? Unfortunately, google searching these commands gets ignored because they're so short.
Best approach to Windows Forms rolling log output in TextBox Modify a class definition's annotation string parameter at runtime On a fresh install of TL 2018, on Linux, no tikz graph drawing libraries can be found.  The files, e.g. texlive/2018/texmf-dist/tex/generic/pgf/graphdrawing/tex/pgflibrarygraphdrawing.trees.code.tex are there.  \documentclass{scrartcl}   \usepackage{tikz} \usetikzlibrary{graphdrawing} \usegdlibrary{trees}    \begin{document}  Hello World  \end{document}   Compiling with lualatex yields   ! Package pgf Error: Graph drawing library 'trees' not found. How to use SSH to run a local shell script on a remote machine? What's your preferred way of getting current system status (current CPU, RAM, free disk space, etc.) in Python? Bonus points for *nix and Windows platforms.  There seems to be a few possible ways of extracting that from my search:   Using a library such as  (that currently seems not actively developed and not supported on multiple platform) or something like  (again no activity since 2007 it seems and no support for Windows). Using platform specific code such as using a os.popen("ps") or similar for the *nix systems and MEMORYSTATUS in ctypes.windll.kernel32 (see ) for the Windows platform. One could put a Python class together with all those code snippets.   It's not that those methods are bad but is there already a well-supported, multi-platform way of doing the same thing? LIGO has announced the detection of gravitational waves on 11 Feb, 2016. I was wondering why the detection of gravitational waves was so significant?   I know it is another confirmation of general relativity (GR), but I thought we had already confirmed GR beyond much doubt. What extra stuff would finding gravitational waves teach us? Is the detection of gravitational waves significant in and of itself, or is there data which can be extracted from the waves which will be more useful? How to Uninstall Blender Software I installed Blender for a project working on and it's way more than I need. I'd like to uninstall it, but can't figure out how to do so. It's not showing up in Programs (using Windows 9) and I can't find instructions on how to remove it in the Blender documentation. Any assistance would be greatly appreciated. Thanks. How do I find this limit: $\lim_{n\to\infty} \left[ n-{n\over e}\left(1+{1\over n}\right)^n \right]$? I'm working on a practice exam for my masters quals and I am having difficulties with the following limit. According to wolfram alpha, it's value is 1/2. Does anyone know how to find this limit?   $$\lim_{n\to\infty} \left[ n-{n\over e}\left(1+{1\over n}\right)^n \right].$$ Empty intersection and empty union There is a shop in the starting area on the island of Koholint, and if you are fast enough to dance around the shopkeeper, you can steal from him. Once you steal from him, though, your title in the game changes to "THIEF".    Is there any way to change your title back to your name without reverting to a different past save or starting over? Sort by author in Alpha bibliography Using the alpha bibliography style, citations are sorted by the citation key. I'd like to use the same style of authors-year citation keys (e.g., [CP92]) but have the bibliography sorted by the first author's lastname instead of alphabetically by the citation key itself. This would keep the same papers by the same first author together.  For example, alpha would produce the following sorted order:        [Cha81] D. Chaum. Untraceable...   [CL04] J. Camenisch and A. Lysyanskaya. Signature...   [CP92] D. Chaum and T. Pedersen. Wallet...      Whereas, abbr would produce the following sorted order:        [1] J. Camenisch and A. Lysyanskaya. Signature...   [2] D. Chaum. Untraceable...   [3] D. Chaum and T. Pedersen. Wallet...      I am looking for the same sorting as abbr but maintaining the citation key style of alpha.  Is there a way to achieve this hybrid style? Existence of subgroup of order six in $A_4$ Show that  the  alternating  group  $A_4$  of all even permutations of $S_4$ does not contain a  subgroup of order $6$.   For me am thinking to write all elements of $A_4$ and trying to find every cyclic subgroup generated by each element of $A_4$, then I have to check whether there exist such a subgroup or not! This is a long procedure for me, I ask if there is a short way to do this. $e^{mx}$ in solving second order differential equations In a book I am reading on differential equations, the author writes about the solution to a homogenous, linear, second order differential equation with constant coefficients. The author says something like, "Let us suppose that the solution is of the form $y=e^{mx}$ " . After this the author introduces the characteristic equation of a differential equation of the form mentioned above, and proceeds to describe how to solve it w/ undetermined coefficients, variation of parameters, etc.   How did mathematicians first come up with this "assumption" that the solution was of the form $y=e^{mx}$? And, are there any other forms of solutions for these types of equations? One of my friends argues that princessship is the only word which has 3 identical letter comes together (s) ,but I think there is no word such as princessship.  Can anyone tell me whether this is a real word, and if there are any more English words which have 3 letters consecutively? copy ssh private keys to another computer What is the name for these type of images? I love these kind of graphics and it's so flat which totally matches my current product development.      Do we have a name for it? A name will make it easier to search for examples and how to's. Free, open-source substitutes for Mendeley? Is hiding the ball allowed in football? Imagine all our football team except one player form a tight circle, with our hands on the shoulders of the people next to us.  Inside the circle there is the eleventh person with the ball. The whole "construction" is moving slowly towards the opponent's goal. It is inevitable that we will score.  Is this illegal? If yes, according to what rule? How to compute prediction bands for non-linear regression? Example of vector space such that $cv = 0$ where $c \ne 0$ and $v \ne \vec{0}$ Is there an example of a vector space $V/F$ such that $0 \ne c \in F$, $\vec{0} \ne v \in V$, but $c \cdot v = 0 $?  I couldn't think of an example.