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• How do I limit the users a specific user can run commands in linux?

  - by user8571

  I have 2 user accounts, foo and bar I want to allow user foo to execute commands as root and any other user ie: sudo su root -c'./run-my-script' sudo su bar -c'./another-script' sudo su another -c'./yet-another-script I also want to allow user bar to execute commands as other user but only a subset and not root ie: sudo su bar -c'./run-my-script' but not sudo su root -c'./run-my-script' Is this possible ?

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• Why is BIND giving me a SERVFAIL in this case? (Notes inside)

  - by imaginative

  Woke up this morning to a bunch of the following: root@foo:/etc/bind# dig @1.2.3.4 foo.example.com ; <<>> DiG 9.6.1-P2 <<>> @1.2.3.4 foo.example.com ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 36121 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;;foo.example.com. IN A ;; Query time: 0 msec ;; SERVER: 1.2.3.4#53(1.2.3.4) ;; WHEN: Thu Apr 1 09:57:59 2010 ;; MSG SIZE rcvd: 31 Some background on the fictitious "1.2.3.4". It's a slave name server in my nameserver "farm". Technically I have ns1 (being the master) and ns2/ns3. Currently ns1/ns2 are down for maintenance, so I left ns3 at it serving live traffic. That's the point, DNS is supposed to be resilient. Now the odd part is, "1.2.3.4" was serving requests for example.com just fine for the last 4-5 days. This morning I get a phone call that it's non-responsive. After investigation I see the message you see above, SERVFAIL. I looked into the zone file and saw the following: example.com IN SOA ns1.example.com. hostmaster.mail.example.com. ( I wondered if at this point that the nameserver thought it was not authoritative over example.com and adjusted it to the following: example.com IN SOA ns3.example.com. hostmaster.mail.example.com. ( After that, it started responding again for all authoritative queries for example.com. I have no idea why. I thought these things were supposed to be normalized upon zone transfer from ns1 - ns3? Can someone please example why this happened and how to prevent it from happening in the future? I've never had a similar problem, and because I don't understand it well, I might be missing some critical information in this question. So please let me know if I can further add any detail to make things clearer as well. One more thing to note: I have other domains that I'm authoritative for that have their SOA still saying ns1.example.com. and not ns3.example.com. Those domains are serving requests just fine! Is it a matter of time before they stop also and I have to change SOA to ns3.example.com? Is this also only required because ns1 and ns2 are currently offline?

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• nginx dynamic virtual hosts

  - by Anagio

  With nginx is there a method to setup mass dynamic virtual hosts similar to the way apache2 can be configured? I'm setting up an saas application each user will have their own subdomain and i'd like to use nginx over apache2. Thanks Code below should be how to configure map $http_host $subdir { hostnames; default "default"; .foo.bar.com "foo"; .baz.bar.com "baz"; } server { root /path/to/$subdir; }

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• How can I recursively verify the permissions within a given subdirectory?

  - by Mike

  I'd like to verify that nothing within /foo/bar is chmod 777. Or, alternatively, I'd like to make sure that nothing within /foo/bar us owned by user1 or in group1. Is there any way I can recursively verify the permissions within a given subdirectory to make sure there aren't any security holes? Notice that I do not want to change all the permissions to something specific, nor do I want to change the owner to something specific, so a recursive chmod or chown won't do it... Thanks!

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• Can I include the path and query string in an IIS "Error Pages" redirect?

  - by Dylan Beattie

  I'm setting up a custom 403.4 handler so that non-SSL requests to my site are redirected to a different URL - and what I'd like to do is to include the script path and query string in the redirect, so that a user who requests http://www.site.com/foo?bar=1 will be redirected to https://www.site.com/foo?bar=1 I know something similar is possible when configuring a top-level site redirect, using the $S, $Q, %v tokens referred to in this IIS reference page - but this syntax doesn't seem to work when configuring a custom error redirect.

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• Change directory upwards to specified goal

  - by haakon

  I'm often deep inside a directory tree, moving upwards and downwards to perform various tasks. Is there anything more efficient than going 'cd ../../../..'? I was thinking something along the lines of this: If I'm in /foo/bar/baz/qux/quux/corge/grault and want to go to /foo/bar/baz, I want to do something like 'cdto baz'. I can write some bash script for this, but I'd first like to know if it already exists in some form.

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• *Why* does using /dev/null in find/grep display the file name?

  - by Jonathan

  find . -name "*.java" -exec grep "foo" {} \; This just prints matches, no file name. find . -name "*.java" -exec grep "foo" /dev/null {} \; But this prints file name as well. Why? What are the mechanics of find/grep that cause file name to print when /dev/null is inserted into the mix? PS - yes, I know I can do "grep -H"

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• Rewrite new url and block old url in nginx

  - by Howard

  I have a local folder /bar, and I want to be able access via http://www.example.com/foo. So I have the config like rewrite ^/foo/(.*)$ /bar/$1 last; At the same time, I want to block public access to the real url /bar, Then I add the config like location ~* ^/bar{ return 404; } But when I add this url into the config, the 1st config above not work, now both return 404 Anything I should fix in order to make the rewrite work? Thanks.

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• How to remove a non-empty directory which is not owned by the user in Linux?

  - by Alex B

  If a directory "foo" is owned by user A and contains a directory "bar", which is owned by root, user A can simply remove it with rmdir, which is logical, because "foo" is writable by user A. But if the directory "bar" contains another root-owned file, the directory can't be removed, because files in it must be removed first, so it becomes empty. But "bar" itself is not writable, so it's not possible to remove files in it. Is there a way around it? Or, convince me otherwise why it's necessary.

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• Requisite of file.append

  - by Jeff Strunk

  Is it possible to make salt require that a particular file was appended to as opposed to the file merely existing? It seems like I can only require a file state. The source looks like it strips out any method names from a require attribute. In the example below, I only want the foo service to run if my lines have been appended to /etc/security/limits.conf. file.append: - name: /etc/security/limits.conf - text: - root hard nofile 65535 - root soft nofile 65535 foo: service.running: - enable: True - require: - file.append: /etc/security/limits.conf

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• .htaccess to pass FULL URL into other PHP link as $_GET

  - by 4lvin

  From .htacces file, how to pass/redirect the FULL URL to another URL as GET Variable? Like: http://www.test.com/foo/bar.asp will be redirected to: http://www.newsite.com/?url=http://www.test.com/foo/bar.asp With Full Url with Domain.I tried: RewriteEngine on RedirectMatch 301 ^/(.*)\.asp http://www.newsite.com/?url=%{REQUEST_URI} But it is going out like: http://www.newsite.com/?url=?%{REQUEST_URI}

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• Is it possible to combine a list of torrents into one torrent with many files, keeping the seeds?

  - by Zequez

  Let's say you have all the episodes of FOO series that you downloaded as they were out, so you have like 20 torrents. Now let's say you want to make a bundle torrent with all the files, call it "FOO Season 1", and then send it to someone. One way would be to create a new torrent with all the episodes, but you would lose all the seeds from the current torrents, and you also couldn't seed people that want to download single episodes. Is this possible with the BitTorrent protocol?

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• Using custom DataContractResolver in WCF, to transport inheritance trees involving generics

  - by Benson

  I've got a WCF service, in which there are operations which accept a non-generic base class as parameter. [DataContract] class Foo { ... } This base class is in turn inherited, by such generics classes as [DataContract] class Bar : Foo { ... } To get this to work, I'd previously have to register KnownTypes for the Foo class, and have these include all possible variations of Bar (such as Bar, Bar and even Bar). With the DataContractResolver in .NET 4, however, I should be able to build a resolver which properly stores (and restores) the classes. My questions: Are DataContractResolvers typically only used on the service side, and not by the client? If so, how would that be useful in this scenario? Am I wrong to write a DataContractResolver which serializes the fully qualified type name of a generic type, such as Bar1[List1[string, mscorlib], mscorlib] ? Couldn't the same DataContractResolver on the client side restore these types?

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• How to remove AspxAutoDetectCookieSupport=1

  - by Veejay

  I have a url like http://www.foo.com/Show.aspx?pageid=10. However to some users this gets displayed as http://://www.foo.com/Show.aspx?pageid=10&AspxAutoDetectCookieSupport=1 Now i read that the AspxAutoDetectCookieSupport=1 gets appended as in my web.config since I have my web.config as <sessionState cookieless="AutoDetect"/> whereas it should be <sessionState cookieless="UseCookies"/> What I wanted to know is that is there an issue doing this change. Is there any other way to just have the url show up as http://www.foo.com/Show.aspx?pageid=10

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• How do I use SharpSVN to programatically "add to ignore list" for a folder.

  - by Myster

  How do I use SharpSVN to programatically to add a folder to the ignore list? EDIT: Attempted: Here's what I've tried svnClient.GetProperty(new SvnUriTarget("svn://svn.foo.com/" + DatabaseName + "/"), SvnPropertyNames.SvnIgnore, out ignores); ignores += " Artifacts"; var args = new SvnSetPropertyArgs() { BaseRevision = ???, LogMessage = "update ignore list" }; svnClient.SetProperty(new Uri("svn://svn.foo.com/" + DatabaseName + "/"), SvnPropertyNames.SvnIgnore, ignores, args); But I don't know how to get the BaseRevision (I can get it manually, and that works, but all the combinations of GetProperty I tried don't seem to give it to me.) SOLUTION: Based on Bert's Answer SvnGetPropertyArgs getArgs = new SvnGetPropertyArgs(){}; string ignores = "Artifacts"; string result; if(svnClient.GetProperty(new SvnUriTarget("svn://svn.foo.com/" + ProjectName + "/trunk/"), SvnPropertyNames.SvnIgnore,out result)) { ignores = result + " Artifacts"; //TODO: check for existing & tidy formatting. } svnClient.SetProperty(UncPath.TrimEnd('\\'), SvnPropertyNames.SvnIgnore, ignores); SvnCommit(svnClient);

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• Bash alias and bash function with several arguments

  - by sanemat

  I want to use both bash alias and bash function with several arguments. I emulate svn sub commands. $ svngrep -nr 'Foo' . $ svn grep -nr 'Foo' . My expectation is both act as below: grep --exclude='*.svn-*' --exclude='entries' -nr 'Foo' . But actual, only alias ('svngrep') does well, function ('svn grep') causes invalid option error. How to write my .bashrc? #~/.bashrc alias svngrep="grep --exclude='*.svn-*' --exclude='entries'" svn() { if [[ $1 == grep ]] then local remains=$(echo $@ | sed -e 's/grep//') command "$svngrep $remains" else command svn "$@" fi }

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• Serving static content with jetty 7, using defaultservlet configured from web.xml

  - by Chilly

  Hi All, This is jetty 7 and xml configured, not embedded. I'm trying to serve a static file, crossdomain.xml, to an app that connects to a datasource I run from jetty. To do this, I configured a servlet and its mapping thus: default org.eclipse.jetty.servlet.DefaultServlet resourceBase /moo/somedirectory default /* Sadly all I get are 404's. Any help would be much appreciated, btw the rest of my web.xm lfile looks like: <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5" cometd org.cometd.server.continuation.ContinuationCometdServlet 1 cometd /cometd/* default org.eclipse.jetty.servlet.DefaultServlet resourceBase /foo/foo default /* initializer com.foo.research.Initializer 2 cross-origin org.eclipse.jetty.servlets.CrossOriginFilter cross-origin /cometd/* </web-app>

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• idioms for returning multiple values in shell scripting

  - by Wang

  Are there any idioms for returning multiple values from a bash function within a script? http://tldp.org/LDP/abs/html/assortedtips.html describes how to echo multiple values and process the results (e.g., example 35-17), but that gets tricky if some of the returned values are strings with spaces in. A more structured way to return would be to assign to global variables, like foo () { FOO_RV1="bob" FOO_RV2="bill" } foo echo "foo returned ${FOO_RV1} and ${FOO_RV2}" I realize that if I need re-entrancy in a shell script I'm probably doing it wrong, but I still feel very uncomfortable throwing global variables around just to hold return values. Is there a better way? I would prefer portability, but it's probably not a real limitation if I have to specify #!/bin/bash.

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• Nullable One To One Relationships with Integer Keys in LINQ-to-SQL

  - by Craig Walker

  I have two objects (Foo and Bar) that have a one-to-zero-or-one relationship between them. So, Foo has a nullable foreign key reference to Bar.ID and a (nullbusted) unique index to enforce the "1" side. Bar.ID is an int, and so Foo.BarID is a nullable int. The problem occurs in the LINQ-to-SQL DBML mapping of .NET types to SQL datatypes. Since int is not a nullable type in .NET, it gets wrapped in a Nullable<int>. However, this is not the same type as int, and so Visual Studio gives me this error message when I try to create the OneToOne Association between them: Cannot create an association "Bar_Foo". Properties do not have matching types: "ID", "BarID". Is there a way around this?

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• How to list all (groovy) classes in JVM in groovy

  - by Dan

  I am writing a DelegatingMetaClass that I would like to apply to all groovy classes in my project, but I do not how to get hold of all classes in the project? Here is the code: /* This will work ok, since I know Foo beforehand, but what about classes that do not exist yet? */ def myMetaClass = new DelegatingMetaClass(Foo.class) InvokerHelper.metaRegistry.setMetaClass(Foo.class, myMetaClass) /* how to do this? allGroovyClasses.each{ def myMetaClass = new DelegatingMetaClass(it) InvokerHelper.metaRegistry.setMetaClass(it, myMetaClass) } */ class SimpleInterceptor extends DelegatingMetaClass{ public SimpleInterceptor(final Class aclass) { super(aclass); initialize(); } public Object getProperty(Object object, String prop) { println ("I am in a property interceptor!!!") return super.getProperty(object, prop) } public Object invokeMethod(Object a_object, String a_methodName, Object[] a_arguments) { println ("I am in a method interceptor!!!") return super.invokeMethod(a_object, a_methodName, a_arguments) }

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• Updating fields of values in a ConcurrentDictionary

  - by rboarman

  I am trying to update entries in a ConcurrentDictionary something like this: class Class1 { public int Counter { get; set; } } class Test { private ConcurrentDictionary<int, Class1> dict = new ConcurrentDictionary<int, Class1>(); public void TestIt() { foreach (var foo in dict) { foo.Value.Counter = foo.Value.Counter + 1; // Simplified example } } } Essentially I need to iterate over the dictionary and update a field on each Value. I understand from the documentation that I need to avoid using the Value property. Instead I think I need to use TryUpdate except that I don’t want to replace my whole object. Instead, I want to update a field on the object. After reading this blog entry on the PFX team blog: Perhaps I need to use AddOrUpdate and simply do nothing in the add delegate. Does anyone have any insight as to how to do this?

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• C++ Preprocessor string literal concatenation

  - by ezpz

  I found this regarding how the C preprocessor should handle string literal concatenation (phase 6). However, I can not find anything regarding how this is handled in C++ (does C++ use the C preprocessor?). The reason I ask is that I have the following: const char * Foo::encoding = "\0" "1234567890\0abcdefg"; where encoding is a static member of class Foo. Without the availability of concatenation I wouldnt be able to write that sequence of characters like that. const char * Foo::encoding = "\01234567890\0abcdefg"; Is something entirely different due to the way \012 is interpreted. I dont have access to multiple platforms and I'm curious how confident I should be that the above is always handled correctly - i.e. I will always get { 0, '1', '2', '3', ... }

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• LINQ list of sublist

  - by Nelson

  I'm trying to get all the sublists that don't inherit from a specified class and also get the parent/root list type. I can't quite figure out the syntax. Here's an example of the sort of thing I'm looking for. Thanks for any help you can give! public class Foo { public IList<Type> Bar { get; private set; } } List<Foo> test = new List<Foo>(); // Initialize, add values, etc. var result = from f in test from b in f.Bar where !b.IsSubclassOf(typeof(AnotherClass)) select f.GetType(), b

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• Remove redundant CSS rules

  - by ken

  I have several CSS files all being used in a large application; most are legacy, with one "main" css file that is the most current. This setup came about after a rebranding, and instead of redoing all of the CSS, we simply added a new CSS file that would override the rules from the legacy files. So now, I'd like to distill all of this CSS (1000's of lines) into 1 file. NOTE: I don't want to simply combine the files (as in copy/pasting them all into 1 file); I need an application to semi-intelligently look at the rules, reduce them down to only the effective rules (after inheritance), but I can't find anything like that. Example; given: /* legacy.css */ .foo { color: red; margin: 5px; } ..and: /* current.css */ .foo { margin: 10px; } I need a tool to output: /* result.css */ .foo { color: red; margin: 10px; } Does such an application exist?

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• struct to bidimensional struct pointer assigment in C

  - by argos.void

  i want to get work this code and i googled and asked in efnet and freenode but i didnt find the answer. what i want i to assign a struct woot to an another bidimensional struct woot *, and i need malloc to do that. then, how can i use malloc there and how to assign the struct? thanks. #include <stdio.h> struct omg { int foo; }; struct woot { struct omg *localfoo; int foo; }; int a = sizeof(struct woot); int main(void){ struct woot *what[10][10] = (struct woot *) malloc(100*a); struct omg hahaha[100]; hahaha[1].foo = 15; what[1][6].localfoo = &hahaha[1]; }

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