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Edit: README.md
# lookpath [](https://badge.fury.io/js/lookpath) [](https://www.npmjs.com/package/lookpath) [](https://github.com/otiai10/lookpath/actions/) [](https://codecov.io/gh/otiai10/lookpath) [](https://codeclimate.com/github/otiai10/lookpath/maintainability) [](https://app.fossa.com/projects/git%2Bgithub.com%2Fotiai10%2Flookpath?ref=badge_shield) To check if the command exists and where the executable file is, **WITHOUT** using `child_process`. ``` npm install lookpath ``` # Example usage ```js const { lookpath } = require('lookpath'); const p = await lookpath('bash'); // "/bin/bash", otherwise "undefined" ``` # Advanced usage ```js const p = await lookpath('bash', { include: ['/home/hiromu/.bin'], exclude: ['/mnt'] }); // include: Do scan also under `~/.bin` // exclude: Do NOT scan under `/mnt` ``` # Motivation - I don't want to spawn `child_process` in order to kick `which`, `where`, `whereis`, or `command -v`. - [node.js - Node - check existence of command in path - Stack Overflow](https://stackoverflow.com/questions/34953168/node-check-existence-of-command-in-path/) - [Node.js: Check if a command exists - Gist](https://gist.github.com/jmptable/7a3aa580efffdef50fa9f0dd3d068d6f) - [mathisonian/command-exists: node module to check if a command-line command exists - GitHub](https://github.com/mathisonian/command-exists) - then I checked Go implementation of [`exec.LookPath`](https://golang.org/pkg/os/exec/#LookPath). - [src/os/exec/lp_unix.go - The Go Programming Language](https://golang.org/src/os/exec/lp_unix.go?s=928:970#L24) - so I concluded that scanning under `$PATH` or `$Path` is the best straightforward way to check if the command exists. # Issues - https://github.com/otiai10/lookpath/issues Any feedback would be appreciated ;) # License [](https://app.fossa.com/projects/git%2Bgithub.com%2Fotiai10%2Flookpath?ref=badge_large)
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