Add Last Argument Of The Last Command as a unix til

unix/last-argument-of-the-last-command.md

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+# Last Argument Of The Last Command
+
+You can use `!$` as a way to reference the last argument in the last
+command. This makes for an easy shortcut when you want to switch out
+commands for the same long file name. For instance, if you just ran `cat` on
+a file to see its contents
+
+```bash
+$ cat /Users/jbranchaud/.ssh/config
+```
+
+and now you want to edit that file. You can just pass `!$` to the `vim`
+command:
+
+```bash
+$ vim !$
+```
+
+Hit enter or tab to get the full command:
+
+```bash
+$ vim /Users/jbranchaud/.ssh/config
+```
+
+h/t Dorian Karter