Create oneliners.md

Author: dadav

Diff for: oneliners.md

@@ -0,0 +1,6 @@
+# some useful oneliners
+
+```bash
+# remove invalid image files
+fd -e jpg -e jpeg -e png -0 | xargs -0 -r -P8 -I{} sh -c "identify -regard-warnings -- {} &>/dev/null || { echo {} is invalid. I will remove it now; rm -- {}"
+```