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+##  ! is not allowed in the middle of pipelines. Use command group as in `cmd | { ! cmd; }` if necessary.
+
+### Problematic code:
+
+```sh
+cat | ! tee /dev/full
+```
+
+### Correct code:
+
+Either negate the entire pipeline (this is equivalent unless `pipefail` is set):
+
+```sh
+! cat | tee /dev/full
+```
+
+Or use a command group to negate a single stage:
+
+```sh
+cat | { ! tee /dev/full; }
+```
+### Rationale:
+
+[POSIX specifies](https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_02) that a status negation operator `!` is only used to negate the status of an entire pipeline, not individual stages.
+
+By default the status of a pipeline is that of the last command, so use `!` in front of the pipeline to negate as necessary.
+
+If you have set the option `pipefail` to OR the status of each stage together, and want to negate the status of only a single stage, you can use negate inside a `{ ! command group; }`.
+
+### Exceptions:
+
+Ksh supports `!` in front of individual pipeline stages. ShellCheck does not warn when the shebang declares that the script will run with Ksh.
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!
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