Question 287463 in Javascript Question posted in
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Javascript – macOs Nodejs open the terminal by passing the command to execute

I have the following code that should open a terminal and run a command:

import { ChildProcess, spawn, ChildProcessWithoutNullStreams, ChildProcessByStdio } from 'child_process';
import { Writable, Readable } from 'stream';

const terminal: 
ChildProcessWithoutNullStreams | 
ChildProcessByStdio<Writable, Readable, Readable> |
ChildProcess = spawn('open', ['-b', "com.googlecode.iterm2"]);

terminal.on('spawn', () => {
  console.log("spawn_0")
  if (terminal.stdin) {
    console.log("spawn_1")
    terminal.stdin.write(`tail -n +1 -f ${cacheDir}/${nameFile}.txtn`);
    terminal.stdin.end();
  }
});

terminal.on('open', () => {
  console.log("open_0")
  if (terminal.stdin) {
    console.log("open_1")
    terminal.stdin.write(`tail -n +1 -f ${cacheDir}/${nameFile}.txtn`);
    terminal.stdin.end();
  }
});

currently when this code is run, this is printed in the console:

spawn_0
spawn_1

The terminal opens correctly, but the "ls" command does not execute.

Info:

I have a txt file, which is continuously updated.
I have to make sure that when the user calls this part of code, the terminal chosen by the user is started, redirecting the file output to the terminal.

Tags:

2

Answers


  1. 0

    Try this script.

    import { spawn } from 'child_process';

const terminal = spawn('open', ['-b', 'com.googlecode.iterm2']);

terminal.on('exit', (code, signal) => {
  console.log(`Child process exited with code ${code} and signal ${signal}`);
});

terminal.on('error', (err) => {
  console.error(`Error: ${err.message}`);
});

terminal.stdout?.on('data', (data) => {
  console.log(`stdout: ${data}`);
});

terminal.stderr?.on('data', (data) => {
  console.error(`stderr: ${data}`);
});

terminal.on('close', (code, signal) => {
  console.log(`Child process closed with code ${code} and signal ${signal}`);
});

// Wait for iTerm2 to open before sending the command
setTimeout(() => {
  terminal.stdin?.write('lsn');
  terminal.stdin?.end();
}, 2000);
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  2. 0

    Thank you for the clarification. If you want to redirect the output of a continuously updated text file to the terminal, and you’ve specified that ls is a placeholder for the actual command you want to execute, and considering the challenges you’ve mentioned, let’s try this code.

    import { spawn } from 'child_process';
import * as fs from 'fs';

const terminal = spawn('open', ['-b', 'com.googlecode.iterm2']);

terminal.on('exit', (code, signal) => {
  console.log(`Child process exited with code ${code} and signal ${signal}`);
});

terminal.on('error', (err) => {
  console.error(`Error: ${err.message}`);
});

terminal.stdout?.on('data', (data) => {
  console.log(`stdout: ${data}`);
});

terminal.stderr?.on('data', (data) => {
  console.error(`stderr: ${data}`);
});

// Replace 'ls' with your actual command
const command = 'tail -n +1 -f /path/to/your/file.txt';

// Wait for iTerm2 to open before sending the command
setTimeout(() => {
  terminal.stdin?.write(`${command}n`);
  terminal.stdin?.end();
}, 2000);

    Here, I’ve replaced ls with a placeholder command (tail -n +1 -f /path/to/your/file.txt) that continuously outputs the contents of a text file. Make sure to replace /path/to/your/file.txt with the actual path to your continuously updated text file.

    This modified code should open iTerm2, wait for 2 seconds, and then send the specified command to continuously display the contents of the text file in the terminal.

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