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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Tue, 1 Sep 2015 16:16:30 -0700
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Comments: In reply to Mikael Magnusson <mikachu@gmail.com>
        "Re: [patch] "which"-builtin writes diagnostics to stdout" (Sep  1,  8:12am)
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Subject: Re: [patch] "which"-builtin writes diagnostics to stdout
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On Sep 1,  8:12am, Mikael Magnusson wrote:
}
} I guess the problem here is that in other shells, whence does not
} exist, and which prints 'not found' to stderr.

As far as I can tell, in other shells "which notacommand" prints NOTHING
on stdout or stderr.

} Zsh's which acts like the csh variant even in the sh emulation, so
} finding the absolute path of a command portably is pretty difficult.

Really?  This seems to work pretty well in bash/ksh/zsh (I don't have
dash/ash to try):

    if absolute_path="$(which $1)"
    then echo "Absolute path of $1 is $absolute_path"
    fi