Node - check existence of command in path

command-exists
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nodejs exec command
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zsh check if command exists

I have a unique problem where I need to use Node to iterate over several Unix-style commands and see if they exist in the path of a Windows installation.

For instance, Windows doesn't support ls natively. However, supposing someone installed git and checked to include Unix commands, it would.

I need to know whether or not ls and other commands are in the system path.

Right now, I'm using child_process to run help on each command. I then check the response of running it. This is messy and dangerous. I don't want to run 30 arbitrary commands from Node:

var spawnSync = require('child_process').spawnSync;
var out = spawnSync('ls', ['/?'], {encoding: 'utf8'});

How else can I check for the existence of these commands?


You could use whereis in Linux, and where in Windows, to see if the executable can be found

var isWin = require('os').platform().indexOf('win') > -1;

var where = isWin ? 'where' : 'whereis';

var spawn = require('child_process').spawn;

var out = spawn(where + ' ls', ['/?'], {encoding: 'utf8'});

out.on('close', function (code) {
    console.log('exit code : ' + code);
});

Node - check existence of command in path - node.js - html, I have a unique problem where I need to use Node to iterate over several Unix- style commands and see if they exist in the path of a Windows installation. The way to check if a file exists in the filesystem, using Node.js, is by using the fs.existsSync () method: const fs = require('fs') const path = './file.txt' try { if (fs.existsSync(path)) { //file exists } } catch(err) { console.error(err) } This method is synchronous. This means that it’s blocking.


How to check if a file exists in Node.js, The way to check if a file exists in the filesystem, using Node.js, is by using the fs. existsSync() method: const fs = require('fs') const path = '. PRVG-04001: Failed to check existence of Windows registry key "{0}" on node "{1}", [{2}] Cause: Could not check the existence of specified Windows registry key on the identified node. Action: Look at the accompanying messages and respond accordingly. PRVG-04002: Missing '-user <user_name>' argument for selected privilege delegation method "{0}".


Could you not check in your Path directories, and see if the ls command file exists.

If the files doesn't exist in the directories, then it's not in path.

mathisonian/command-exists: node module to check if a , var commandExistsSync = require('command-exists').sync; // returns true/false; doesn't throw if (commandExistsSync(� -e FILE - True if the FILE exists and is a file, regardless of type (node, directory, socket, etc.).-f FILE - True if the FILE exists and is a regular file (not a directory or device).-G FILE - True if the FILE exists and has the same group as the user running the command.-h FILE - True if the FILE exists and is a symbolic link.


DON'T use child_process just for that, neither packages which use child_process internally. As Matt already answered, the most straightforward way is just checking under your Path.

Here is a NPM lookpath package which scans your $PATH or $Path.

const { lookpath } = require('lookpath');

const p = await lookpath('bash');
// "/bin/bash"

This is a Node.js port of exec.LookPath from Go.

Hope it helps

Node.js: Check if a command exists � GitHub, Node.js: Check if a command exists. cmd-exists.js. // returns a Promise which fulfills with the result of a shell command. // rejects with stderr. This command is used to list and display the children of a znode. Syntax ls /path Sample ls /MyFirstZnode Output [zk: localhost:2181(CONNECTED) 2] ls /MyFirstZnode [mysecondsubnode, myfirstsubnode] Check Status. Status describes the metadata of a specified znode. It contains details such as Timestamp, Version number, ACL, Data length, and Children znode.


Check if a Directory Exists in NodeJS, access() function. This function takes a directory path as an argument and is usually used to test a user's permission for a file or directory. But, if� XPath uses path expressions to select nodes or node-sets in an XML document. The node is selected by following a path or steps. The XML Example Document.


How to check if a file exists in Node.js, path — The file or directory path for testing the user's permissions. mode — An optional integer that specifies the accessibility check to be� Install npm install lookpath Background. I DON'T want to spawn child_process JUST in order to kick which, where, whereis, or command -v.. node.js - Node - check existence of command in path - Stack Overflow


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