which
Like which(1) unix command. Find the first instance of an executable in the PATH.
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.
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 })
Just like the BSD which(1)
binary but using node-which
.
usage: node-which [-as] program ...
You can learn more about why the binary is node-which
and not which
here
You may pass an options object as the second argument.
-
path
: Use instead of thePATH
environment variable. -
pathExt
: Use instead of thePATHEXT
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.