fix shellcheck errors in 1986/stein/stein.sh

1986/stein/stein.sh

@@ -15,11 +15,27 @@ make CC="$CC" all >/dev/null || exit 1
 # clear screen after compilation so that only the entry is shown
 clear
 
-echo "$ ./stein \$(printf \"\\015\\015\"); echo" 1>&2
-./stein $(printf "\015\015"); echo
+# With SC2016 shellcheck doesn't understand how to parse '"'"'.
+# With SC2028 we want to output the literal \ character.
+#
+# SC2016 (info): Expressions don't expand in single quotes, use double quotes for that.
+# SC2028 (info): echo may not expand escape sequences. Use printf.
+# https://www.shellcheck.net/wiki/SC2016
+# https://www.shellcheck.net/wiki/SC2028
+# shellcheck disable=SC2016,SC2028
+echo '$ ./stein $(printf '"'"'\015\015'"'"'); echo' 1>&2
+./stein "$(printf '\015\015')"; echo
 
-echo "$ ./stein \$(printf \"\\014\\015\"); echo" 1>&2
-./stein $(printf "\014\015"); echo
+# With SC2016 shellcheck doesn't understand how to parse '"'"'.
+# With SC2028 we want to output the literal \ character.
+#
+# SC2016 (info): Expressions don't expand in single quotes, use double quotes for that.
+# SC2028 (info): echo may not expand escape sequences. Use printf.
+# https://www.shellcheck.net/wiki/SC2016
+# https://www.shellcheck.net/wiki/SC2028
+# shellcheck disable=SC2016,SC2028
+echo '$ ./stein $(printf '"'"'\014\015'"'"'); echo' 1>&2
+./stein "$(printf '\014\015')"; echo
 
 echo "$ ./stein" 1>&2
 ./stein