Add Enable Multi-Select Of Results With fzf as a unix til

unix/enable-multi-select-of-results-with-fzf.md

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+# Enable Multi-Select Of Results With fzf
+
+You can pipe the output of any command to
+[`fzf`](https://github.com/junegunn/fzf) and it will display it line-by-line in
+a list that you can then fuzzy-find against.
+
+By default you get to pick _one_ of those results. That result will go to
+stdout, either printing to the terminal or being piped to the next command.
+
+For some combinations of commands, it makes more sense to be able to select
+_multiple_ results. `fzf` supports this with the `-m` (or `--multi`) flag.
+
+```bash
+$ ls | fzf -m | xargs cat
+```
+
+For instance, this series of commands pipes the output of `ls` (files and
+directoris) to `fzf`. The `-m` flag means that you can hit `Tab` (or
+`Shift+Tab`) to select multile entries. When you hit enter, each of the
+selected entries will be executed one by one with `cat`.
+
+I show a slightly more practical example of this in [Make One-Line Commands
+Interactive with fzf](https://www.youtube.com/watch?v=wf5eXdwfVws).
+
+See `man fzf` for more details.