Created SC2188 (markdown)

SC2188.md

@@ -0,0 +1,33 @@
+## This redirection doesn't have a command. Move to its command (or use 'true' as no-op).
+
+### Problematic code:
+
+```sh
+{ 
+  echo "Report for $(date +%F)"
+  uptime
+  df -h
+}
+  > report.txt
+```
+
+### Correct code:
+
+```sh
+{ 
+  echo "Report for $(date +%F)"
+  uptime
+  df -h
+} > report.txt
+```
+### Rationale:
+
+ShellCheck found a redirection that doesn't actually redirect from/to anything.
+
+This could indicate a bug, such as in the problematic code where an additional linefeed causes `report.txt` to be truncated instead of containing report output, or in `foo & > bar`, where either `foo &> bar` or `foo > bar &` was intended. 
+
+However, it could also be intentionally used to truncate a file or check that it's readable. You can make this more explicit for both ShellCheck and human readers by using `true` or `:` as a dummy command, e.g. `true > file` or `: > file`. 
+ 
+### Exceptions:
+
+There are no semantic problems with using `> foo` over `true > foo`, so if you don't see this as a potential source of bugs or confusion, you can [[ignore]] it.