/usr/bin/which -> type -P

[bukzor]

This allows odd POSIXen (i.e. Android) to (at least attempt to) function.

Ported from Linuxbrew/brew#621

[MikeMcQuaid]

This isn't the same behaviour as which -a; it produces a single result rather than multiple.

[sjackman]

I suggest using the bash builtin type -ap rather than the external command which -a. This script is #!/bin/bash.

❯❯❯ type type which
type is a shell builtin
which is hashed (/usr/bin/which)
❯❯❯ which -a git
/usr/local/bin/git
/usr/bin/git
❯❯❯ type -ap git
/usr/local/bin/git
/usr/bin/git

[MikeMcQuaid]

I suggest using the bash builtin type -ap rather than the external command which -a. This script is #!/bin/bash.

Works for me. There may be other locations where that would be useful/needed too.

[bukzor]

Do you like bash-isms in this project? For example, dash doesn't like type -ap.

[MikeMcQuaid]

Do you like bash-isms in this project?

Yup, we use a bunch and we require /bin/bash 👍

[maxim-belkin]

To be absolutely sure that you're using a builtin, a not /usr/bin/type alter-ego, prefix the command with builtin: builtin type -ap :)

[MikeMcQuaid]

Thanks again @bukzor!

[bukzor]

@maxim-belkin Is there any case where $PATH will override a built-in? I was pretty sure that builtin is only useful for avoiding a function or alias of the same name.

Also, I can't find any mention of /usr/bin/type. What is it?

[maxim-belkin]

builtins can be disabled with enable -n but otherwise - you're correct.
On my mac, there is a bunch of /usr/bin/<filename> with the following contents:

#!/bin/sh
# $FreeBSD: src/usr.bin/alias/generic.sh,v 1.2 2005/10/24 22:32:19 cperciva Exp $
# This file is in the public domain.
builtin `echo ${0##*/} | tr \[:upper:] \[:lower:]` ${1+"$@"}

and type is one of them...
See https://stackoverflow.com/a/38809607

[MikeMcQuaid]

I'm happy with this as-is. We can investigate further if we hit any bugs.