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+## Warning: deletes a system directory. Use 'rm --' to disable this message.
+
+### Problematic code:
+
+    rm -rf /usr /lib/nvidia-current/xorg/xorg
+
+### Correct code:
+
+    rm -rf /usr/lib/nvidia-current/xorg/xorg
+
+### Rationale:
+
+The example line of code was an actual bug in the [Bumblebee NVIDIA driver](https://github.com/MrMEEE/bumblebee-Old-and-abbandoned/commit/a047be85247755cdbe0acce6f1dafc8beb84f2ac).
+
+Due to an accidental space, it deleted `/usr` instead of just the particular directory.
+
+### Exceptions:
+
+In cases of chroot, initramfs and similar, it's reasonable to delete otherwise important directories. Due to this, Shellcheck will not warn if the command contains `--`:
+
+    rm -rf -- /usr
+
+This is an arbitrary convention to allow deleting such directories without having to use a [[directive]] to silence the warning.
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