diff --git a/dotfiles/zshrc.d/usage.zsh b/dotfiles/zshrc.d/usage.zsh
new file mode 100644
index 0000000..cb6804b
--- /dev/null
+++ b/dotfiles/zshrc.d/usage.zsh
@@ -0,0 +1,3 @@
+function duf {
+     du -sk "$@" | sort -n | while read size fname; do for unit in k M G T P E Z Y; do if [ $size -lt 1024 ]; then echo -e "${size}${unit}t${fname}"; break; fi; size=$((size/1024)); done; done
+}