1. If you want, install bash, if you want, learn sh (or ksh).
2. If you want /opt directory, just create it (or even create a partition and mount it to /opt, but you'll have to change some settings if you're going to install third-party software there), otherwise look at /usr/local/, it has everything from installed packages.
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mazocomp$ uname -a
OpenBSD mazocomp.lan 6.3 GENERIC.MP#47 amd64
mazocomp$
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