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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.os.linux.misc
Subject: Re: Path and/or alias finding
Date: Wed, 31 Jul 2024 07:17:37 -0000 (UTC)
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On Fri, 14 Jun 2024 18:50:02 +0000, Robert Heller wrote:

> marchhare% which dir
> dir:     aliased to ls -F -C
> marchhare% echo $SHELL
> /bin/tcsh

I don’t think it’s specified by POSIX. bash has the “type” builtin which, 
being builtin, can report on whether a given command is itself a builtin 
or alias or function or an external executable.