Add Check The Installed OpenSSL Version as a Unix TIL

unix/check-the-installed-openssl-version.md

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+# Check The Installed OpenSSL Version
+
+Typically with command line tools, I can use a `--version` or `-v` flag with
+the command to get it to output the current version. This is not the case with
+`openssl`.
+
+When I do this:
+
+```bash
+$ openssl --version
+```
+
+I get an Invalid Command message and then a bunch of subcommands are displayed.
+
+One of those subcommands listed under _Standard Commands_ is the `version`
+command. This is what I can use to list the version.
+
+```bash
+$ openssl version -v
+LibreSSL 2.8.3
+```
+
+See `man openssl` for more details.