Updated SC2091 (markdown)

SC2091.md

@@ -9,6 +9,15 @@ then
 fi
 ```
 
+or
+
+```sh
+make_command() {
+  printf 'cat header %q footer > %q\n' "$1" "$2" | tee log
+}
+$(make_command)
+```
+
 ### Correct code:
 
 ```sh
@@ -18,6 +27,14 @@ then
 fi
 ```
 
+or 
+
+```sh
+make_command() {
+  printf 'cat header %q footer > %q\n' "$1" "$2" | tee log
+}
+eval "$(make_command)"
+```
 ### Rationale:
 
 ShellCheck has detected that you have a command that just consists of a command substitution.
@@ -32,13 +49,11 @@ Sometimes this results in this confounding `command not found` messages. Other t
 
 The solution is simply to remove the surrounding `$()`. This will execute the command instead of the command's output.
 
+If you instead have based a script around generating shell command strings, you can use `eval "$(cmd)"` to evaluate the output of a command as a second command. The benefit of using `eval` is that quotes, pipes, redirections, and other shell constructs will work as expected. Without the `eval`, all these will be treated as literal strings instead.
+
 ### Exceptions:
 
-If you really want to execute the output of a command rather than the command itself, you can ignore this message or assign the output to a new variable first:
+None.
-```sh
-readonly command_to_execute="$(print_the_command)"
-$command_to_execute
-```
 
 ### Related resources: