I have a thread that is calling std::getline(std::cin,input) and another thread that wakes up every x mins and checks a status. If the status is True my whole c++ application needs to terminate/shutdown. Problem is getline() is a blocking call and when I set loop_status to true it still wont stop since getline() is blocking.… Read More Stop all c++ threads

I’m writing a program that should work like the following unix command: seq 2 number | awk argument | grep argument #define READ 0 #define WRITE 1 void die(char* msg){ perror(msg); exit(EXIT_FAILURE); } int main(int argc, char *argv[]) { int seq_to_awk[2]; if(pipe(seq_to_awk) == -1) die("pipe"); pid_t child = fork(); if(child == -1) die("fork"); if(child ==… Read More No correct redirection between pipes

I need a utility that read from stdin, split as lines write to stdout json object, {"cmd": "In", "lines": [lines from stdin]} I heard jq being quite powerful, how to acheive above with jq or similar tools. >Solution : By default, jq reads from stdin. The -R flag lets you read raw input streamed linewise.… Read More how transform stdin input to some json field in list of lines using jq

I want to read user input from inside a bash script test.sh: #!/bin/bash read -p "Do you want to continue? (y/n) " yn case $yn in [yY] ) echo "Doing stuff…"; echo "Done!";; [nN] ) echo "Exiting…"; exit;; * ) echo "Invalid response";; esac When running the script directly using either ./test.sh or bash test.sh… Read More How to read user input from a script piped to bash

I’m writing a script to process a data file, and started with these two command lines: proc(){ echo $1 ; } while read -r line ; do proc "$line"; done <data.csv | less To my surprise, I found a listing of the current directory in the middle of the output, and realised it appears where… Read More why does bash 'read' expand a wildcard appearing in stdin to yield a directory listing?

I have the following code to read user input keys from terminal using termion use std::io::{stdin, stdout}; use termion::event::Key; fn main() { let mut stdout = stdout().into_raw_mode().unwrap(); let stdin = stdin(); let char_from_config = ‘e’; for c in stdin.keys() { match c.unwrap() { Key::Char(‘q’) => { break; } Key::Char(‘h’) => { // do something }… Read More How to read stdin keys in rust with termion using dynamic char values?

User input function C Hi all! I’ve got a problem with reading user input from a console. I am trying to implement function that reads and allocates memory from the console in chunks. First issue First issue is I am getting some artifacts at the beginning of the output. For an input: Sample input 1… Read More User input function C

I can use this python file from a library to make a read request of a temperature sensor value via BACnet protocol by running this command from terminal: echo ‘read 12345:2 analogInput:2 presentValue’ | py -3.9 ReadProperty.py And I can see in the console the value of 67.02999114990234 is returned as expected. I apologize if… Read More retrieve value from python shell beginner question