Add Check The Installed OpenSSL Version as a Unix TIL

Author: jbranchaud

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1336 TILs and counting..._
+_1337 TILs and counting..._
 
 ---
 
@@ -1249,6 +1249,7 @@ _1336 TILs and counting..._
 - [Check If Command Is Executable Before Using](unix/check-if-command-is-executable-before-using.md)
 - [Check SSH Key Fingerprints Of Known Hosts](unix/check-ssh-key-fingerprints-of-known-hosts.md)
 - [Check The Current Working Directory](unix/check-the-current-working-directory.md)
+- [Check The Installed OpenSSL Version](unix/check-the-installed-openssl-version.md)
 - [Clear The Screen](unix/clear-the-screen.md)
 - [Command Line Length Limitations](unix/command-line-length-limitations.md)
 - [Compare Two Variables In A Bash Script](unix/compare-two-variables-in-a-bash-script.md)

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

@@ -0,0 +1,23 @@
+# 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.