Add an alternative for supporting

SC3040.md

@@ -44,6 +44,14 @@ If the file has been written to when the pipeline is done, it means one of the c
 
 This can obviously be extended with e.g. `echo "cmd1=$?" >> file` if the particular exit codes for particular commands are desired.
 
+If `pipefail` or other options are used only as a sanity check, another option is to try the setting in a subshell and only apply it in the main shell if successful. This will set the flag on platforms where `sh` is linked to `ash`, `busybox`, or `bash`, but do nothing if `sh` is `dash`.
+
+```sh
+# Set pipefail if it works in a subshell, disregard if unsupported
+# shellcheck disable=SC3040
+(set -o pipefail 2> /dev/null) && set -o pipefail
+```
+
 Alternatively, switch to a shell that supports `pipefail`, such as Bash.
 
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