stdin

问题 What I want to do is the following: read in multiple line input from stdin into variable A make various operations on A pipe A without losing delimiter symbols ( \n , \r , \t ,etc) to another command The current problem is that, I can't read it in with read command, because it stops reading at newline. I can read stdin with cat , like this: my_var=`cat /dev/stdin` , but then I don't know how to print it. So that the newline, tab, and other delimiters are still there. My sample script looks

问题 I'm writing a shell script that should be somewhat secure i.e. does not pass secure data through parameters of commands and preferably does not use temporary files. How can I pass a variable to the stdin of a command? Or, if it's not possible, how to correctly use temporary files for such task? 回答1: Something as simple as: echo "$blah" | my_cmd 回答2: Passing a value to stdin in bash is as simple as: your-command <<< "$your_variable" Always make sure you put quotes around variable expressions!

问题 I have a file that I read from, it contains a bunch of lines each with a different number of integers, I'm having trouble splitting it up into a vector of a vector of ints. This is my current code. std::vector<int> read_line() { std::vector<int> ints; int extract_int; while((const char*)std::cin.peek() != "\n" && std::cin.peek() != -1) { std::cin >> extract_int; ints.push_back(extract_int); } return ints; } std::vector<std::vector<int> > read_lines() { freopen("D:\\test.txt", "r", stdin);

问题 I wanna write boost::asio app which is reading from stdin with boost::asio::streambuf. Anyway the only function which works on streambuf made from STDIN_FILENO is boost::asio::async_read_until. The other ones throws errors. Is there any possibility to read 100 first character from stdin with boost asio function? 回答1: In principle this just works #include <boost/asio.hpp> #include <boost/asio/posix/stream_descriptor.hpp> using namespace boost::asio; using boost::system::error_code; #include

问题 I'm on a mac using Scala, and I want to create a Python interpreter as a subprocess that my program interacts with. I've been using Process with a ProcessIO, but python insists on running in non-interactive mode. So it only does anything after I close down its input and kill the process. Is there a way to force it to run in interactive mode, so that I can keep the Python process alive and interact with it? This sample code (which I'm pasting into a Scala repl) shows the problem: import scala

问题 So if i have a program that takes stdin such as 1 5 2 4 How exactly can i go through each line and say print that value, This is what im thinking: #include <iostream> using namespace std; int main() { while ( // input has ended// ) { cout << //current line// //increment to next line// } return 0; } Is there such a way or no? 回答1: The pattern that I like is: while (!cin.eof()) { string line; getline(cin, line); if (cin.fail()) { //error break; } cout << line << endl; } As in the other answers,

问题 So if i have a program that takes stdin such as 1 5 2 4 How exactly can i go through each line and say print that value, This is what im thinking: #include <iostream> using namespace std; int main() { while ( // input has ended// ) { cout << //current line// //increment to next line// } return 0; } Is there such a way or no? 回答1: The pattern that I like is: while (!cin.eof()) { string line; getline(cin, line); if (cin.fail()) { //error break; } cout << line << endl; } As in the other answers,

问题 On my platform, the following code allows me to successfully read from stdin even if its end-of-file flag is set, which also remains set after the read. To reproduce the behavior, first type the end-of-file shortcut ( Ctrl + D on Unix, Ctrl + Z on Windows) and then type a normal character. #include <stdio.h> // first type the shortcut for EOF, then a single character int main(void) { getchar(); printf("feof(stdin): %s\n", feof(stdin) ? "true" : "false"); int ch = getchar(); if (ch == EOF)

问题 My last resort is asking here. I'm new to Golang and I've made simple programs. I'm trying to do the following: Using golang: 1 - run a container 2 - accept input stdin to the container The example I want to use is the hashicorp/terraform docker image, I want to do a simple terraform apply but I need to wait for user input below is the code I have working so far...anyone trying the exact code below needs to update the AWS environment variables or change the terraform test file to another

问题 The contents of stdin is getting corrupted with word wrapping and trailing "=" throughout which obviously breaks the URL that I need to post. I need to extract a URL/link from an email then post the URL. So, I'm piping my email to a php script in cpanel using a standard code snip I've seen all over the internet: $fd = fopen("php://stdin", "r"); $email = ""; // This will be the variable holding the data. while (!feof($fd)) { $email .= trim(fread($fd, 1024)); } fclose($fd); Then dumping the