add misc.md

misc.md

@@ -0,0 +1,17 @@
+## cannot remove '/tmp/env-vars': Operation not permitted
+
+If, when running nix-shell this happens:
+
+```
+coper:~/dot_testing/boxes/phone/init$ nvim shell.nix
+coper:~/dot_testing/boxes/phone/init$ nix-shell
+install: cannot remove '/tmp/env-vars': Operation not permitted
+```
+
+remove `/tmp/env-vars` (it's owned by root for some reason):
+
+```
+$ sudo rm /tmp/env-vars
+```
+
+Is there a fix for this?