spawn

问题 I need to spawn a separate python process that runs a sub script. For example: main.py runs and prints some output to the console. It then spawns sub.py which starts a new process. Once main.py has spawned sub.py it should terminate whilst sub.py continues to run. Thank you. Edit: When I run main.py it prints 'main.py' but nothing else and sub.py doesn't launch. main.py print "main.py" import subprocess as sp process=sp.Popen('sub.py', shell=True, stdout=sp.PIPE, stderr=sp.PIPE) out, err =

问题 I'm spawning a process in node and tracking the output of the command like this: proc.stdout.on("data", function (data) { console.log(data.toString()); }); It works well, however, the output seems to be splitting the lines: npm http 304 https://registry.npmjs.org/underscore The above is just one line out of the response from an npm install . Typically this is all in one line, it's also adding line breaks before and after the response. Is there a way to get the data output to look like the

问题 I'm learning to write a TCL (expect) scripts and I notice that some examples show to use spawn, while others show the command exec. I tried googling, but can't find what is the difference? Suppose I call 'exec' in a middle of a long expect script, what can I expect to happen? 回答1: spawn is an expect command not a tcl command. exec is a tcl command. spawn creates a process. The processes' input and output are connected to expect for use by the other expect commands: send , expect and interact

问题 I feel like I'm missing something. Here is what I want to achieve : Having a grunt task that executes my server.js and runs watch task in parallel. It feels to me that this is precisely one of the tasks grunt was designed for but I can't achieve this configuration. Among others, I have read this : Running Node app through Grunt but I still can't make it. Here is my Gruntfile.js : module.exports = function(grunt) { // Project configuration. grunt.initConfig({ watch: { scripts: { files: ['*.js'

问题 I'm running a command with Node.js using child_process.spawn: #!/usr/bin/js var spawn = require("child_process").spawn; var stockfish = spawn("stockfish"); This works fine using $js spawntest.js from the command line; it just hangs like you would expect because the subcommand is waiting for input. When I set this script up as a supervisord program, however, it fails: $ sudo supervisorctl start spawntest spawntest: ERROR (abnormal termination) Here is the contents of the stderror output log

问题 I'm running a command with Node.js using child_process.spawn: #!/usr/bin/js var spawn = require("child_process").spawn; var stockfish = spawn("stockfish"); This works fine using $js spawntest.js from the command line; it just hangs like you would expect because the subcommand is waiting for input. When I set this script up as a supervisord program, however, it fails: $ sudo supervisorctl start spawntest spawntest: ERROR (abnormal termination) Here is the contents of the stderror output log

问题 I use nodejs to captured its child process's stdout data, but always captured the former part of child process's stdout data. When I add fllush(stdout) ，It works OK. But I don't know why, and don't want to add flush(stdout). Here is my code: var tail_child = spawn(exefile, [arg1, arg2, arg3]); tail_child.stdin.write('msg\n'); tail_child.stdout.on('data', function(data) { console.log(data); }); child_process.c printf("data\n"); Need your help! Thank you very much! 回答1: By default, stdout in

问题 (nodeA@foo.hyd.com)8> spawn(nodeA@bar.del.com, tut, test, [hello, 5]). I want to spawn a process on bar.del.com which has no file system access to foo.hyd.com (from where I am spawning the process), running subroutine "test" of module "tut". Is there a way to do so, w/o providing the nodeA@bar.del.com with the compiled "tut" module file? 回答1: You can use the following function to load a module at remote node without providing the file itself: load_module(Node, Module) -> {_Module, Bin,

问题 I currently have an operation in a module that is blocking, so I'm looking at making this into a child process that I fork instead. If I want to do that, then I of course need to modify the architecture of my module. The module requires that a dependency is injected by calling the module as a function, passing in the dependency, like so: var dependency = { name: "Bob" } require('worker')(dependency) Then in my worker module: module.exports = function (dependency) { // Outputs { name: "Bob" }

问题 Consider the following C program (test.c): #include <stdio.h> int main() { printf("string out 1\n"); fprintf(stderr, "string err 1\n"); getchar(); printf("string out 2\n"); fprintf(stderr, "string err 2\n"); fclose(stdout); } Which should print a line to stdout, a line to stderr, then wait for user input, then another line to stdout and another line to stderr. Very basic! When compiled and run on the command line the output of the program when complete (user input is received for getchar()):