I have an account with secondary group membership in a group that owns a directory.  The directory is chmod 760, which should allow writing to the directory, but not listing it.  However, this is not allowed.  Can somebody explain why?  Rationale: mostly academic; trying to understand permissions in detail.  I recognize that I could make the permissions 770 and allow this; I'm not an idiot (at least I don't think so).  I just want to understand what write permissions actually mean for a directory, if not file creation.  Code example:  powerdave@dhirsch-centos:/tmp &gt;groups powerdave wheel share powerdave@dhirsch-centos:/tmp &gt;ls -alh total 124K drwxrwxrwt.  5 root      root      4.0K Feb 23 15:08 ./ dr-xr-xr-x. 23 root      root      4.0K Feb 23 14:57 ../ drwxrw----.  2 guest     share     4.0K Feb 23 14:52 test/ powerdave@dhirsch-centos:/tmp &gt;touch test/file touch: cannot touch `test/file': Permission denied
In my CMS, I noticed that directories need the executable bit (+x) set for the user to open them. Why is the execute permission required to read a directory, and how do directory permissions in Linux work?
"All of the ...." or " All the ... "? Keyboard layout/language changes in every boot List all files in all subfolders In windows, is there any way to get a list of all files in a folder, including all the files within all the subfolders? Of Half-elven and mortal life When half-elvens choose mortal life, how would their bodies behave?  Half-elven are always elves by nature. Ever since they're born, their physical body and behaviour would be elvish - they have keen senses, they don't get physically weary, no illness, and so on.  Half-elvens are then offered a choice - Immortal elvish lives or mortal fate of men. When they choose the latter, like Elros and Arwen did, what would happen to their elvish nature? Would they lose it? I don't think they would lose their pointy ears, but what about the other elvish features that I mentioned before?  Are there any canonical references? Does the sign of scores or of loadings in PCA or FA have a meaning? May I reverse the sign? Say I have two normal distributions A and B with means $\mu_A$ and $\mu_B$ and variances $\sigma_A$ and $\sigma_B$. I want to take a weighted mixture of these two distributions using weights $p$ and $q$ where $0\le p \le 1$ and $q = 1-p$. I know that the mean of this mixture would be $\mu_{AB} = (p\times\mu_A) + (q\times\mu_B)$.  What would the variance be?    A concrete example would be if I knew the parameters for the distribution of male and female height. If I had a room of people that was 60% male, I could produce the expected mean height for the whole room, but what about the variance? How to change the name of document elements like "Figure", "Contents", "Bibliography", "Appendix", etc.? I'd like to modify the names used to typeset some of my document elements. For example, the caption of figure floats should change from "Figure" to "Fig.", and my \tableofcontents sectioning heading shouldn't read "Contents", but "Table of Contents". How can I do that?  \documentclass{article} % \usepackage[english]{babel} \begin{document} \tableofcontents \section{foo} \begin{figure}[h] \centering \rule{1cm}{1cm}% placeholder for graphic \caption{A figure} \end{figure} \end{document} This is a question you can read everywhere on the web with various answers:  $ext = end(explode('.', $filename)); $ext = substr(strrchr($filename, '.'), 1); $ext = substr($filename, strrpos($filename, '.') + 1); $ext = preg_replace('/^.*\.([^.]+)$/D', '$1', $filename);  $exts = split("[/\\.]", $filename); $n    = count($exts)-1; $ext  = $exts[$n];   etc.  However, there is always "the best way" and it should be on Stack Overflow. How to only append to clipboard (but not overwrite current data)? I have a rather large file, I need to copy the entire contents somewhere, but when I scroll down the page all the data I have selected becomes unselected. I could just copy and paste block by block, but I would find it much easier as there is a lot of data, to just be able to append the contents to the end of the current clipboard data. Is that possible?  That is so that I can have a keyboard shortcut which will enable me to copy this to the clipboard:  I am some nice new text.   When this is what is already there:  I am the old text.   And have it look like this when pasted:  I am the old text. I am some nice new text.   So there are 3 things that I would really like from this (I would have 3 separate keyboard shortcuts to do this):   Append the data to the end of the clipboard and have it put in a RETURN before it (as shown in the example above). Append the data to the end of the clipboard but have it so that there is not RETURN before it so that it would continue on on the same line initially. Have all this but so that the data is put at the beginning of the clipboard before all the data which is currently there.   I am running Ubuntu GNOME 16.04 with GNOME 3.20. So I'm pretty sure there's at least 2, one for both X &amp; Y.   Much like other iterations of the other Pokemon games, are there other Legendaries? How many legendaries, and what are their names? Possible Duplicate:          In  the following claim was mentioned:  $R/I \otimes_R M \cong M / IM$  So I tried to prove it. Can you help me finish my proof? Thanks!    We recall that $M \otimes_R -$ is a covariant right-exact functor that it is exact if $M$ is flat and we observe that the following is an exact sequence: $$ 0 \to IM \xrightarrow{i} M \xrightarrow{\pi} M / IM \to 0$$  $R/I$ is an $R$ module since $R/I$ is a subring of $R$ closed with respect to multiplication from $R$ but it is not necessarily flat hence we only get exactness on one side:  $$  (R/I) \otimes_R IM \xrightarrow{id \otimes i} (R/I) \otimes_R M \xrightarrow{id \otimes \pi} (R/I) \otimes_R M / IM \to 0$$  Then $$ \mathrm{Im(id \otimes \pi)} = (R/I) \otimes_R M / IM  \cong (R/I) \otimes_R M / \mathrm{Ker} (id \otimes i) $$  so we want to show two things:   (i) that $\mathrm{Ker} (id \otimes i) = \{0\}$. To this end let $r + I \otimes im \in (R/I) \otimes_R  IM $ and assume $ id \otimes i(r + I \otimes im ) = r + I \otimes im = 0 + I \otimes 0$. I'm not sure how to proceed from here.   (ii) and that $M /IM \cong (R/I) \otimes_R M / IM $  Can you help me? Thanks. Synthetic division of polynomials by factor of the form $(ax+b)$ How and when is old-releases.ubuntu.com updated? Is there an American English equivalent of the British idiom "carrying coals to Newcastle"? I'm an American living in the Netherlands who is learning Dutch. There's an idiom in Dutch that describes performing a needless/futile activity, "water naar de zee dragen," which literally translates to "carrying water to the sea." My Dutch parents-in-law asked me if there was an English equivalent, but I couldn't think of one.  In doing   , I found that the English translation given for the this idiom is always "carrying coals to Newcastle." This was the first time I'd ever come across the phrase, and subsequent searches revealed that it was indeed of  , though one site I found did . However, neither I nor any of my culturally American friends have ever heard of this phrase.   Is there an American English idiom or phrase that carries the same connotations for carrying out a futile activity? Is there any specific word for a person who is always online on the Internet?  I am just curious to know because staying online is like a profession nowadays. How do I determine how many spell slots I have if I multiclass into more than one spellcasting class? For example, I have a character that is a level 3 Wizard, a level 5 Eldritch Knight Fighter, a level 4 Arcane Trickster Rogue, a level 4 Paladin, and a 4 Warlock. How many spell slots do I have and how do I determine this? Why are objects at rest in motion through spacetime at the speed of light? 32-bit vs. 64-bit systems What are the differences between 32-bit and 64-bit systems?  If you have used both of them, what kind of sharp differences have you experienced?   Would it be a problem to use 32-bit programs on 64-bit systems in some cases? When I click on 'Business Data Connectivity Services' link on 'Manage Service Application' page of Central Administration, I get the following error : "The load balancer is not provisioned. Verify the load balancer was provisioned successfully before retrieving endpoint addresses. " I got a solution from  link, but as per instruction I am unable to install the hotfix for SharePoint 2013. Is there any solution available for this problem? Thanks in advance What is the best way to remove and prevent leaf stains on concrete pavers?