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  • Bison input analyzer - basic question on optional grammer and input interpretation

    - by kumar_m_kiran
    Hi All, I am very new to Flex/Bison, So it is very navie question. Pardon me if so. May look like homework question - but I need to implement project based on below concept. My question is related to two parts, Question 1 In Bison parser, How do I provide rules for optional input. Like, I need to parse the statment Example : -country='USA' -state='INDIANA' -population='100' -ratio='0.5' -comment='Census study for Indiana' Here the ratio token can be optional. Similarly, If I have many tokens optional, then How do I provide the grammer in the parser for the same? My code looks like, %start program program : TK_COUNTRY TK_IDENTIFIER TK_STATE TK_IDENTIFIER TK_POPULATION TK_IDENTIFIER ... where all the tokens are defined in the lexer. Since there are many tokens which are optional, If I use "|" then there will be many different ways of input combination possible. Question 2 There are good chance that the comment might have quotes as part of the input, so I have added a token -tag which user can provide to interpret the same, Example : -country='USA' -state='INDIANA' -population='100' -ratio='0.5' -comment='Census study for Indiana$'s population' -tag=$ Now, I need to reinterpret Indiana$'s as Indiana's since -tag=$. Please provide any input or related material for to understand these topic. Thanks for your input in advance.

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  • Is there a POSIX syscall to resolve file system paths?

    - by Mike
    Is there a POSIX syscall to resolve filesystem paths? I have the CWD for a path, as well as the path to a file from that CWD. I can't use chdir to switch to the directory because I need to resolve paths from multiple threads simultaneously. I considered appending a / in between the CWD and the path, but for some reason it feels like that's hacky. Is that the proper way to resolve relative paths?

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  • Detect number of IDLE processors ruby

    - by Yannick Wurm
    Hello, I work on shared linux machines with between 4 and 24 cores. To make best use of them, I use the following code to detect the number of processors from my ruby scripts: return `cat /proc/cpuinfo | grep processor | wc -l`.to_i (perhaps there is a pure-ruby way of doing this?) But sometimes a colleague is using six or eight of the 24 cores. (as seen via top). How can I get an estimate of the number of currently unused processors that I can use without making anyone upset? Thanks!

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  • Perl script -need some help.

    - by benjamin button
    I have an sql file which will give me an output like below: 10|1 10|2 10|3 11|2 11|4 . . . I am using this in a perl script like below: my @tmp_cycledef = `sqlplus -s $connstr \@DLCycleState.sql`; after this above statement,since tmp_cycledef has all the output of the sql query i want to show the output as: 10 1,2,3 11 2,4 how could i do this using perl?

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  • Is it possible to view the "source" for a ksh function?

    - by stevec
    Our ksh environment defines several functions, which can be listed using then "functions" ksh function. Is it possible to see the definition (ie source code) for these functions? This seems like an obvious question, but I've tried all manner of parameters to the "functions" and "function" functions with no luck. Thanks, Steve

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  • Apache is running but there is no page displayed

    - by Michael Ozeryansky
    I am on a Mac OSX and I am using the built in PHP and Apache2. I have been setting up MySQL and finally when I got MySQL working my local site won't display. Do note that I did have the web server running and delivering PHP enabled pages, just no database connection. But my question is not about MySQL. I have changed various settings in the 'http.conf' file, and I have the line: '127.0.0.1 localhost' in my hosts file. I also have other alias' pointing to 127.0.0.1. I have checked everything I could about Apache and I have made sure that any message in the error_log is ok. I currently have my errorLevel set to debug, so I get all the messages. At this point (HOURS of self fixing) I think I need help. What can I provide for someone to figure this out with me. Thanks.

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  • remote cpio copy

    - by soField
    remsh remoteserverhostname -l remoteusername find /tmp/a1/ | cpio -o > /tmp/paketr.cpio rcp remoteserverhostname:/tmp/paketr.cpio /tmp/aaa cpio -idmv < /tmp/paketr.cpio i'am trying to get and create directory structure from remote server to local server i can do this with following command list but i wonder if i can do this with just one command by running cpio with pass-through mode remsh remoteserverhostname find /tmp/a1 | cpio -pd /tmp current </tmp/tmp/a1/b1/y1> newer current </tmp/tmp/a1/b1/z1> newer current </tmp/tmp/a1/b2/l2smc> newer "/tmp/a1/b3": No such file or directory Cannot stat </tmp/a1/b3>. 0 blocks so when i try to cpio -pd option , i am expecting it to create directories for me but it does not what can i do ?

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  • Inserting text to a file with Sed within Bash Script

    - by neversaint
    I tried to insert a text to the first line of a file using sed. I do this inside a bash script. But why it hangs at the line of sed execution? #! /bin/bash # Command to execute # ./mybashcode.sh test.nbq nbqfile=$1 nbqbase=$(basename $nbqfile nbq) taglistfiletemp="${nbqbase}taglist_temp" taglistfile="${nbqbase}taglist" ./myccode $nbqfile | sort | uniq -c | awk '{print $2}' > $taglistfiletemp noftags=$(wc -l $taglistfiletemp | awk '{print $1}') echo $noftags # We want to append output of noftags # to the first line of taglistfile sed '1i\ $noftags' > $taglistfile # why it hangs here # the content of taglistfile is NIL

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  • basic device that can connect to internet

    - by Hellnar
    Hello, I am looking for a cheap solution to my problem: I need to find either a common device (that is used in restaurants, bars clubs) or a cheap new device that can connect to internet (via the already existing ethernet or wireless based internet) and do HTTP request/receive response and retrieve information ? (For instance can a POS device connect to internet?) For a project, I need to do identity validation on several restaurants and bars and not all of them have computers. So I will be giving "cheap and easy to use devices" and non-IT personal can use it to do http request to my server and get response. All I can think of is Cell phones and SMS.

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  • Basic Tomcat Servlet error.

    - by ajay
    package mypackage; import java.io.*; import javax.servlet.http.*; import javax.servlet.*; public class Hello extends HttpServlet { public void doGet (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { PrintWriter out = res.getWriter(); out.println("Hello, world!"); out.close(); } } web.xml file is as follows: <?xml version="1.0" encoding="ISO-8859-1"?> <web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4"> <display-name>Hello, World Application</display-name> <description> This is a simple web application with a source code organization based on the recommendations of the Application Developer's Guide. </description> <servlet> <servlet-name>HelloServlet</servlet-name> <servlet-class>mypackage.Hello</servlet-class> </servlet> <servlet-mapping> <servlet-name>HelloServlet</servlet-name> <url-pattern>/hello</url-pattern> </servlet-mapping> </web-app> I am then doing ant all , ant reload and also /etc/init.d/tomcat restart But I get this error on browser: HTTP Status 404 - /hello/ type Status report message /hello/ description The requested resource (/hello/) is not available. Apache Tomcat/6.0.26 What could be wrong?

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  • Perl open call failing.

    - by benjamin button
    I am new to perl coding. I am facing a problem while executing a small script i have: open is not able to find the file which i am giving as an argument.Please see below: File is available: ls -l DLmissing_months.sql -rwxr-xr-x 1 tlmwrk61 aimsys 2842 May 16 09:44 DLmissing_months.sql My perl script: #!/usr/local/bin/perl use strict; use warnings; my $this_line = ""; my $do_next = 0; my $file_name = $ARGV[0]; open( my $fh, '<', '$file_name') or die "Error opening file - $!\n"; close($fh); executing the perl script : > new.pl DLmissing_months.sql Error opening file - No such file or directory what is the problem with my perl script.

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  • set environment variables calling script file

    - by sandeep
    I have a requirement where I have to set environment variables calling a script file eg:set_env.sh. set_env.sh contains all the environment variables. export SCRIPT_DIR=/e/scripts/ ... when I call the set_env.sh from my code the variables are available in that file itself. They are not available in file where I have called the script. What should be done so that environment variables can be retained and can be used in file which calls set_env.sh. Thanks, Sandeep M.

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  • Converting FASTQ to FASTA with SED/AWK

    - by neversaint
    I have a data in that always comes in block of four in the following format (called FASTQ): @SRR018006.2016 GA2:6:1:20:650 length=36 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNGN +SRR018006.2016 GA2:6:1:20:650 length=36 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!+! @SRR018006.19405469 GA2:6:100:1793:611 length=36 ACCCGCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC +SRR018006.19405469 GA2:6:100:1793:611 length=36 7);;).;);;/;*.2>/@@7;@77<..;)58)5/>/ Is there a simple sed/awk/bash way to convert them into this format (called FASTA): >SRR018006.2016 GA2:6:1:20:650 length=36 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNGN >SRR018006.19405469 GA2:6:100:1793:611 length=36 ACCCGCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC In principle we want to extract the first two lines in each block-of-4 and replace @ with >.

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  • Get directory path by fd

    - by tylerl
    I've run into the need to be able refer to a directory by path given its file descriptor in Linux. The path doesn't have to be canonical, it just has to be functional so that I can pass it to other functions. So, taking the same parameters as passed to a function like fstatat(), I need to be able to call a function like getxattr() which doesn't have a f-XYZ-at() variant. So far I've come up with these solutions; though none are particularly elegant. The simplest solution is to avoid the problem by calling openat() and then using a function like fgetxattr(). This works, but not in every situation. So another method is needed to fill the gaps. The next solution involves looking up the information in proc: if (!access("/proc/self/fd",X_OK)) { sprintf(path,"/proc/self/fd/%i/",fd); } This, of course, totally breaks on systems without proc, including some chroot environments. The last option, a more portable but potentially-race-condition-prone solution, looks like this: DIR* save = opendir("."); fchdir(fd); getcwd(path,PATH_MAX); fchdir(dirfd(save)); closedir(save); The obvious problem here is that in a multithreaded app, changing the working directory around could have side effects. However, the fact that it works is compelling: if I can get the path of a directory by calling fchdir() followed by getcwd(), why shouldn't I be able to just get the information directly: fgetcwd() or something. Clearly the kernel is tracking the necessary information. So how do I get to it?

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  • Basic principles of computer encryption?

    - by Andrew
    I can see how a cipher can be developed using substitutions and keys, and how those two things can become more and more complex, thus offering some protection from decryption through brute-force approaches. But specifically I'm wondering: what other major concepts beyond substitution and key are involved? is the protection/secrecy of the key a greater vulnerability than the strength of the encryption? why does encryption still hold up when the key is 'public' ? are performance considerations a major obstacle to the development of more secure encryption?

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  • Need help debugging a very basic PHP SOAP Hello world app

    - by WarDoGG
    I have been breaking my head at this, reading almost every article and tutorial there is on the web, but nothing doing.. i still cannot get my first web service application to work. I would really appreciate it if anyone could debug this code for me and provide me with a good explanation as to what is wrong and why. This will help indeed ! Thanks ! I have pasted below the entire codes that i am using making it easier to debug. I'm using the PHP5 SOAP extension. Here is my WSDL: <?xml version="1.0" encoding="utf-8"?> <wsdl:definitions name="testWebservice" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tm="http://microsoft.com/wsdl/mime/textMatching/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/" xmlns:tns="http://tempuri.org/" xmlns:s1="http://microsoft.com/wsdl/types/" xmlns:s="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/" xmlns:http="http://schemas.xmlsoap.org/wsdl/http/" targetNamespace="http://tempuri.org/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"> <wsdl:types> <s:schema elementFormDefault="qualified" targetNamespace="http://tempuri.org/"> <s:import namespace="http://microsoft.com/wsdl/types/" /> <s:element name="getUser"> <s:complexType> <s:sequence> <s:element minOccurs="0" maxOccurs="1" name="username" type="s:string" /> <s:element minOccurs="0" maxOccurs="1" name="password" type="s:string" /> </s:sequence> </s:complexType> </s:element> <s:element name="getUserResponse"> <s:complexType> <s:sequence> <s:element minOccurs="0" maxOccurs="1" name="getUserResult" type="tns:userInfo" /> </s:sequence> </s:complexType> </s:element> <s:complexType name="userInfo"> <s:sequence> <s:element minOccurs="1" maxOccurs="1" name="ID" type="s:int" /> <s:element minOccurs="1" maxOccurs="1" name="authkey" type="s:int" /> </s:sequence> </s:complexType> </s:schema> </wsdl:types> <wsdl:message name="getUserSoapIn"> <wsdl:part name="parameters" element="tns:getUser" /> </wsdl:message> <wsdl:message name="getUserSoapOut"> <wsdl:part name="parameters" element="tns:getUserResponse" /> </wsdl:message> <wsdl:portType name="testWebservice"> <wsdl:operation name="getUser"> <wsdl:input message="tns:getUserSoapIn" /> <wsdl:output message="tns:getUserSoapOut" /> </wsdl:operation> </wsdl:portType> <wsdl:binding name="testWebserviceBinding" type="tns:testWebservice"> <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http" /> <wsdl:operation name="getUser"> <soap:operation soapAction="http://tempuri.org/getUser" /> <wsdl:input> <soap:body use="literal" /> </wsdl:input> <wsdl:output> <soap:body use="literal" /> </wsdl:output> </wsdl:operation> </wsdl:binding> <wsdl:service name="testWebserviceService"> <wsdl:port name="testWebservicePort" binding="tns:testWebserviceBinding"> <soap:address location="http://127.0.0.1/nusoap/storytruck/index.php" /> </wsdl:port> </wsdl:service> </wsdl:definitions> and here is the PHP Code i use to setup the server: <?php function getUser($user,$pass) { return array('ID'=>1); } ini_set("soap.wsdl_cache_enabled", "0"); // disabling WSDL cache $server = new SoapServer("http://127.0.0.1/mywsdl.wsdl"); $server->addFunction('getUser'); $server->handle(); ?> and the code for the client: <?php $client = new SoapClient("http://127.0.0.1/index.php?wsdl", array('exceptions' => 0)); try { $result = $client->getUser("username","pass"); print_r($result); } catch (SoapFault $result) { print_r($result); } ?> Here is the ERROR output i am getting on the browser : SoapFault Object ( [message:protected] => Error cannot find parameter [string:Exception:private] => [code:protected] => 0 [file:protected] => C:\xampp\htdocs\client.php [line:protected] => 6 [trace:Exception:private] => Array ( [0] => Array ( [function] => __call [class] => SoapClient [type] => -> [args] => Array ( [0] => getUser [1] => Array ( [0] => username [1] => pass ) ) ) [1] => Array ( [file] => C:\xampp\htdocs\client.php [line] => 6 [function] => getUser [class] => SoapClient [type] => -> [args] => Array ( [0] => username [1] => pass ) ) ) [previous:Exception:private] => [faultstring] => Error cannot find parameter [faultcode] => SOAP-ENV:Client )

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