proc

问题 With "lsof" i can check the list of open files is there any command or any other way by which i can detect where the files the files are being accessed. The output of "lsof" command is as follows:- COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME init 1 ??? cwd ??? ??? ??? ??? /proc/1/cwd (readlink: Permission denied) init 1 ??? exe ??? ??? ??? ??? /proc/1/exe (readlink: Permission denied) init 1 ??? root ??? ??? ??? ??? /proc/1/root (readlink: Permission denied) init 1 ??? FDS /proc/1/fd/

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: When to use lambda, when to use Proc.new? (I know it had been asked several times but I couldn't find satisfactory answer)Can somebody please explain Blocks, Procs and Lambdas and why one should be used over other, what are the situation when one should use proc, similar and/or lambda. Also there effect on computer memory. Practical examples please. 回答1: Try Robert Sosinski's Tutorial or Learning to Program by

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: When to use lambda, when to use Proc.new? (I know it had been asked several times but I couldn't find satisfactory answer)Can somebody please explain Blocks, Procs and Lambdas and why one should be used over other, what are the situation when one should use proc, similar and/or lambda. Also there effect on computer memory. Practical examples please. 回答1: Try Robert Sosinski's Tutorial or Learning to Program by

问题 e.g. x = 123 p = Proc.new { x = 'I do not want change the value of the outer x, I want to create a local x' } In Ruby Is there something the same as "my" keyword in Perl ? 回答1: As per the Perl documentation of my,I think you are looking for something like below in Ruby:- x = 123 p = Proc.new {|;x| x = 'I do not want change the value of the outer x, I want to create a local x' } p.call # => "I do not want change the value of the outer x, I want to create a local x" x # => 123 回答2: Beware!

问题 I'm working in a new gem to extend the Ruby Core classes, something similar to Active Support Core Extensions or Powerpack. These days I'm working on the Proc class, for example I added closure composition. But today I like to talk about currying. This is the Ruby standard library functionality for curry : describe "#curry" do it "returns a curried proc" do modulus = ->(mod, num) { num % mod } mod2 = modulus.curry[2] expect(mod2.call(5)).to eq(1) end end I like to add a new rcurry method to

问题 Is there a way (or, ideally, a query) to determine all the tables that a stored procedure accesses, including those accessed by other stored procs that it calls itself (and those that they call, etc. down the call stack). If anyone can fabricate such a query, is it additionally possible to determine whether tables are accessed for update, select or delete? Is it possible to determine the same where views are thrown into the mix? My stored procs do not contain any dynamically-constructed calls

问题 I need to get some statistic(io, network) of a process during its lifetime. Is there anyway to get those information from /proc just before the process exit ? Linux Kernel API ? 回答1: wait4() and struct rusage A simple way to gather some statistics after child process termination is wait4(2) syscall, which can fill rusage struct. ptrace() If it's not enough, you can probably use ptrace(2) to stop a process just before its termination: PTRACE_O_TRACEEXIT (since Linux 2.5.60) Stop the tracee at

问题 I have a dataset of 100 samples, each of which has 195 mutations with their corresponding known clinical significance ("RealClass") and predicted value according to some prediction tool ("PredictionValues") For the demonstration, this is a random dataset that has the same structure as my dataset: predictions_100_samples<-as.data.frame(matrix(nrow=19500,ncol=3)) colnames(predictions_100_samples)<-c("Sample","PredictionValues","RealClass") predictions_100_samples$Sample<-rep(c(1:100), each =

问题 Can I yield a block inside a Proc? Consider this example: a = Proc.new do yield end a.call do puts "x" end What I'm trying to achieve is to print x , but interpreting this with ruby 2.0 raises LocalJumpError: no block given (yield) . 回答1: No you can't, because the Proc you've created is an independent yield - that is, it's a yield that has no block in its context. Although you can call procs with specified parameters and thereby pass the parameters into the proc, yield doesn't work based on

问题 As we know, wo can pass a method to a iterator method by a &: prefix. For example: ["a", "b"].map(&:upcase) #=> ["A", "B"] def rettwo 2 end ["a", "b"].map(&:rettwo) #=> [2, 2] Here is the problem, when I write a method, pass a method with &: prefix to it, I got a error message: "ArgumentError: no receiver given". Let me show the code: def a_simple_method &proc puts proc.class # it shows `Proc` proc.call end def a_iterator_method puts yield end a_simple_method &:rettwo #=> ArgumentError: no