which

Like the unix which utility.

Finds the first instance of a specified executable in the PATH environment variable. Does not cache the results, so hash -r is not needed when the PATH changes.

USAGE

const which = require('which')

// async usage
// rejects if not found
const resolved = await which('node')

// if nothrow option is used, returns null if not found
const resolvedOrNull = await which('node', { nothrow: true })

// sync usage
// throws if not found
const resolved = which.sync('node')

// if nothrow option is used, returns null if not found
const resolvedOrNull = which.sync('node', { nothrow: true })

// Pass options to override the PATH and PATHEXT environment vars.
await which('node', { path: someOtherPath, pathExt: somePathExt })

CLI USAGE

Same as the BSD which(1) binary.

usage: which [-as] program ...

OPTIONS

You may pass an options object as the second argument.

• path: Use instead of the PATH environment variable.
• pathExt: Use instead of the PATHEXT environment variable.
• all: Return all matches, instead of just the first one. Note that this means the function returns an array of strings instead of a single string.

Current Tags

• 3.0.0                                ...           latest (3 years ago)

6 Versions

• 3.0.0                                ...           3 years ago
• 1.3.0                                ...           8 years ago
• 1.0.9                                ...           11 years ago
• 1.2.14                                ...           8 years ago
• 2.0.2                                ...           6 years ago
• 1.3.1                                ...           7 years ago