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  • Why does this simple bash code give a syntax error?

    - by Tim
    I have the following bash code, which is copied and pasted from "bash cookbook" (1st edition): #!/bin/bash VERBOSE=0; if [[ $1 =-v ]] then VERBOSE=1; shift; fi When I run this (bash 4.0.33), I get the following syntax error: ./test.sh: line 4: conditional binary operator expected ./test.sh: line 4: syntax error near `=-v' ./test.sh: line 4: `if [[ $1 =-v ]]' Is this as simple as a misprint in the bash cookbook, or is there a version incompatibility or something else here? What would the most obvious fix be? I've tried various combinations of changing the operator, but I'm not really familiar with bash scripting.

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  • RESTful API: How to model 'request new password'?

    - by Jan P.
    I am designing a RESTful API for a booking application and was quite happy to see I could map all details of the application to the 4 HTTP methods. /users - GET, POST /users/({id}|myself) - GET, POST, PUT, DELETE /users/({id}|myself)/bookings - GET, POST /users/({id}|myself)/bookings/{id} - GET, POST, PUT, DELETE Example: Updating my own user uses a PUT to /users/myself. But now I found out that one thing is missing: The possibility to request a new password if I forgot my old one. Any idea how I could add this?

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  • C++ enforce conditions on inherited classes

    - by user231536
    I would like to define an abstract base class X and enforce the following: a) every concrete class Y that inherits from X define a constructor Y(int x) b) it should be possible to test whether two Y objects are equal. For a, one not very good solution is to put a pure virtual fromInt method in X which concrete class will have to define. But I cannot enforce construction. For b), I cannot seem to use a pure virtual method in X bool operator == (const X& other) const =0; because in overridden classes this remains undefined. It is not enough to define bool operator == (const Y& other) const { //stuff} because the types don't match. How do I solve these problems?

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  • Message reason why Execute method failed

    - by waanders
    I use the DAO method Execute to delete some records. If this fails this is clear by checking RecordsAffected (it will be 0). But is it possible to get the error message (for instance, to log or to show to the user)? I've try to delete the records by hand in the Table grid I get a clear dialog message, e.g. "The record cannot be deleted or changed because tabel x includes related records".

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  • C++ struct sorting error

    - by Betamoo
    I am trying to sort a vector of custom struct in C++ struct Book{ public:int H,W,V,i; }; with a simple functor class CompareHeight { public: int operator() (Book lhs,Book rhs) { return lhs.H-rhs.H; } }; when trying : vector<Book> books(X); ..... sort(books.begin(),books.end(), CompareHeight()); it gives me exception "invalid operator <" What is the meaning of this error? Thanks

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  • Query interface for iPhone CoreData store

    - by JT
    Hi, another iPhone newbie question... I have the following: NSPersistentStoreCoordinator NSManagedObjectContext NSManagedObjectModel Is it possible to run queries directly on the store (since its a sqlite DB)? I'm trying to delete all the records from a tableview, and figured a "DELETE FROM table" would be nice and quick as opposed to looping through the records and removing them manually (which i'm also struggling with). Thanks for your time, James

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  • Foreign keys - temporarily bypass?

    - by Industrial
    Hi, I have just started to learn about the pros of foreign keys in database design (mySQL / innoDB) and I wonder if there's any way to temporarily bypass the foreign key when doing a specific delete query, to just delete in the parent table, and not from the linked child tables. Thanks

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  • Can I reproduce Scala's behavior for == ?

    - by JPP
    In Programming in Scala, I can read that the == operator behaves as if it was defined like this: final def == (that: Any): Boolean = if (null eq this) {null eq that} else {this equals that} But there must actually be compiler magic to avoid null pointer exceptions, right? Is there any way for me to replicate this behavior with pure Scala; i.e., have an operator/method return one thing if the receiver is null and another one if it isn't? What I mean is an actual implementation of null eq this. I suppose I can write a "pimp" and then define the method on the wrapper class, but is there a more direct way to do this?

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  • nested sql statements

    - by Hadad
    Hello, I've a self join table when I delete or update it's id I want to delete or update all the direct and indirect affected records SQL server does not allow this type of cycle cascading I've decided to use triggers but this triggers will file recursively and they will be terminated at 34 level and I don't know the depth of records and event I disable the trigger and re enable it after completing the process how can I construct a SQL statement that achieve this logic?

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  • problem in deleting record

    - by akshay
    I have a entity manager em1 .em1 starts a transcation tx on db1 table1.Now inside tx i call a API getdata().This API creastes a new entitymanger em2 and return 1 record.Now if entity manger em1 tries to delete the record returned by em1 , it hangs.Code times out.Is the record locked by em1.How can ii solve this problem? create em1 //em1 start transcation tx1 tx1.start Object r = getData(); em1 tried to delete r //code hangs here tx1.commit Object getData(){ create em2 return data found using em2 }

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  • How do i make a picturebox selectable?

    - by acidzombie24
    I am making a very basic map editor. I'm halfway through it and one problem i hit is how to delete an object. I would like to press delete but there appears to be no keydown event for pictureboxes and it will seem like i will have it only on my listbox. What is the best solution for deleting an object in my editor?

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  • Subtracting months/years from boost::posix_time::ptime

    - by Zack
    I have a boost::posix_time::ptime that points to March 31st 2010 like this: ptime p(date(2010, Mar, 31)); I would like to subtract a month (and possibly years) from this date. From the docs I see these two operators: ptime operator-(time_duration) and ptime operator-(days) but none of them can work with months/years. If I try and do: time_duration duration = hours(24 * 30); ptime pp = p - duration; I'm getting March 1st and if I'm trying: ptime pp = p - days(30); I'm still getting March 1st, while I'd like to get February 28th. How can I achieve my desired result? (I would like to get the desired result also when subtracting a month from March 28, 29, 30)

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  • How to replace the char '[' etc with '\[' using "sed" in a file ?

    - by Abhijeet
    I have a file say "file.txt" with following contents: Capsule arr**[**0**]** in state A rate_ul/dl=**(**2000000/7000000**)** Capsule RBx**[**0**]** in state ... ... using sed operator how can i replace all occurences of '[' with '[', '(' with '(', ']' with ']' and so on. Capsule arr**\[**0**\]** in state A rate_ul/dl=**\(**2000000/7000000**\)** Capsule RBx**\[**0**\]** in state ... ... Using the substitue operator in "gvim" I am able to achieve the same result. ie. if i use ":1,$ s/\[/\\[/g" in the vi editor in command mode I see all the '[' chars replaced with '['. However if I try to use the same substitue command in a shell script using a sed command, i am not able to achieve the same result. ie If i use the following command in a shell script I am not able to achieve the desired result: sed "s/\[/\\[/g" $temp_file2 > $temp_file1 where $temp_file2 conatins the lines with '[' characters and $temp_file1 should contain the replaced '\[' chars

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  • doubt in - Function Objects - c++

    - by Eternal Learner
    I have a class class fobj{ public: fobj(int i):id(i) {} void operator()() { std::cout<<"Prints"<<std::endl; } private: int id; }; template<typename T> void func(T type) { type(); } My Doubt is if I invoke func like Method 1: func(fobj(1); the message I wanted to print is printed. I was always thinking I needed to do something like Method 2: fobj Iobj(1); // create an instance of the fobj class func(Iobj); //call func by passing Iobj(which is a function object) How does Method 1 work? I mean what exactly happens? and how is a call made to the operator() in class fobj ?

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  • logical or expression c++

    - by user1870181
    I have a problem using the Logical OR operator in C++. The problem is coming that the right-side expression is not evaluated if the left-side is true. I have two deque-s and I need to popLeft from them with a while, but if I can pop from the first deque, I don't pop from the second because is not evaluated, by the OR operator. How can I overcome this problem. Here is the piece of code: while( D.popLeft( k ) || E.popLeft( m ) ) { if( k < m ) { C.pushRight( k ); E.pushLeft( m ); } else { C.pushRight( m ); D.pushLeft( k ); } }

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  • Returning objects with dynamic memory

    - by Caulibrot
    I'm having trouble figuring out a way to return an object (declared locally within the function) which has dynamic memory attached to it. The problem is the destructor, which runs and deletes the dynamic memory when the object goes out of scope, i.e. when I return it and want to use the data in the memory that has been deleted! I'm doing this for an overloaded addition operator. I'm trying to do something like: MyObj operator+( const MyObj& x, const MyObj& y ) { MyObj z; // code to add x and y and store in dynamic memory of z return z; } My destructor is simply: MyObj::~MyObj() { delete [] ptr; } Any suggestions would be much appreciated!

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  • Difference between `<%#` and `<%=` and an asp.net ascx file?

    - by jax
    I understand that <%= is for returning a String I seem to usually use <%# in my .ascx files. For example the following works OnClientClick=<%# String.Format("return confirm('Are you sure you wish to delete barcode ({0})?');", Eval("BARCODE") ) %> The following does not work OnClientClick=<%# String.Format("return confirm('Are you sure you wish to delete barcode ({0})?');", Eval("BARCODE") ) %>

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  • Using ANTLR with Left-Recursive Rules

    - by CNevin561
    Basically Ive written a Parse for a language with just basic arithmetic operators ( +, -, * / ) etc, but for the minus and plus cases, the Abstract Syntax Tree which is generated has parsed them as right associative when they need to be left associative. Having a googled for a solution, i found a tutorial that suggests rewriting the rule from: Expression ::= Expression <operator> Term | Term as Expression ::= Term <operator> Expression*. However in my head this seems to generate the tree the wrong way round. Any pointers on a way to resolve this issue?

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  • How to avoid accidental deletions of databases in Lotus Notes?

    - by Saili
    I have always worried about users deleting lotus notes databases by accident. We had one such case last week and I want to know how we can lock the databases so that users cannot delete them. Is there a way in Lotus Notes - either at the Db level or server level where we can set up the database so that only the administer of the db or the user with Manager access can delete the database? Thanks!

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  • Permission to view, but not to change! - Django

    - by RadiantHex
    Hi folks, is it possible to give users the permission to view, but not to change or delete. currently in the only permissions I see are "add", "change" and "delete"... but there is no "read/view" in there. I really need this as some users will only be able to consult the admin panel, in order to see what has been added in. Help would be amazing!

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  • Do I have to start from beginning?

    - by Knowing me knowing you
    If I have: std::size_t bagCapacity_ = 10; std::size_t bagSize = 0; A** bag = new A*[bagCapacity_]; while (capacity--) { bag[capacity] = new A(bagSize++);//**here I'm loading this array from the end is it ok?** } And also can I delete those object from starting at the end of the array? while(capacity--) { delete bag[capacity]; } Question in a code.

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  • Database is very slow when creating an index

    - by kaliyaperumal M
    My database has around 25 core numbers, in that weekly basis I need to create an index and drop index. While creating the index it takes long time to complete, my log file also keeps on increasing, and when I delete some numbers from that table also taking too much time (because weekly basis I have to delete 30 to 50 lack numbers and add 30 to 40 lack new number also). Can u please give me the proper solution..

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  • folder deleting not working

    - by user1150440
    If System.IO.Directory.Exists(HttpContext.Current.Server.MapPath(Server.MapPath("images/TravelogueGallery/" & getMaxID()))) Then System.IO.Directory.Delete(HttpContext.Current.Server.MapPath("images/TravelogueGallery/" & getMaxID()), True) End If I am using the above code snippet to delete a directory but i get this error "'G:\Projects\Latest\LTCIndia 05-04-12 1415\images\TravelogueGallery\19' is not a valid virtual path. " Whats wrong with the code?

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