-rwxr-xr-x  1 root          24 Oct 29  1929 /bin/ed
    -rwxr-xr-t  4 root     1310720 Jan  1  1970 /usr/ucb/vi
    -rwxr-xr-x  1 root  5.89824e37 Oct 22  1990 /usr/bin/emacs

    $ whereis -b ed | cut -d' ' -f 2 | xargs ls -l
    -rwxr-xr-x 1 root root 55504 Feb 22  2020 /usr/bin/ed

(To explain and thus ruin the joke, https://www.gnu.org/fun/jokes/ed-msg.html)

    while :; do echo ?; done

    ls -l $(which ed)