Change the zsh heading to unix.

unix/saying-yes.md

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+# Saying Yes
+
+Tired of being prompted for confirmation by command-line utilities? Wish you
+could blindly respond 'yes' to whatever it is they are bugging you about?
+The `yes` command is what you've been looking for.
+
+```
+$ yes | rm -r ~/some/dir
+```
+
+This will respond `y` as `rm` asks for confirmation on removing each and
+every file in that directory.
+
+`yes` is just as good at saying *no*. Give it `no` as an argument and it
+will happily (and endlessly) print `no`.
+
+```
+$ yes no
+```
+
+h/t [Chris Erin](https://twitter.com/MCNormalMode)