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Help me understand the logic, please - from whereis man:

OPTIONS -b Search for binaries.

But when i use this it returns path to dir:

kl@debian:~$ whereis -b postfix postfix: /usr/sbin/postfix /usr/lib/postfix /etc/postfix kl@debian:~$ whereis --version whereis from util-linux 2.38.1 kl@debian:~$ file /usr/lib/postfix /usr/lib/postfix: directory kl@debian:~$ file /etc/postfix /etc/postfix: directory kl@debian:~$
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whereis isn’t very sophisticated: it matches filenames in a given set of directories. For “binaries”, that includes /etc and /usr/lib, as well as /usr/sbin (and other similar directories), so looking for postfix matches directories in /etc and /usr/lib. You can run whereis -l to see the list of directories it looks at.

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