update zsh with the ones from home dir

Makefile

@@ -5,3 +5,11 @@ zsh:
 		file=$${file#zsh/}; \
 		[ -f "$$HOME/$$file" ] && mv "$$HOME/$$file" "$$HOME/$$file.bak"; \
 	done && cp -r zsh/.[!.]* ~/ && echo "zsh files copied to home directory" || echo "zsh files not copied to home directory"
+
+update-zsh:
+	@for file in zsh/.[!.]*; do \
+        base=$$(basename $$file); \
+        if [ -f "$$HOME/$$base" ]; then \
+            cp -v "$$HOME/$$base" "$$file"; \
+        fi \
+    done && echo "zsh files updated from home directory" || echo "zsh files not updated from home directory"