Updated SC2031 (markdown)

SC2031.md

@@ -4,18 +4,22 @@
 
 There are many ways of accidentally creating subshells, but a common one is piping to a loop:
 
-    n=0
-    printf "%s\n" {1..10} | while read i; do (( n+=i )); done
-    echo $n
+```bash
+n=0
+printf "%s\n" {1..10} | while read i; do (( n+=i )); done
+echo $n
+```
 
 ### Correct code:
 
-    # Bash specific:
-    n=0
-    while read i; do (( n+=i )); done <   <(printf "%s\n" {1..10})
-    echo $n
+```bash
+# Bash specific: process substitution. Also try shopts like lastpipe.
+n=0
+while read i; do (( n+=i )); done < <(printf "%s\n" {1..10})
+echo $n
+```
 
-In `sh`, a temp file can be used instead of process substitution. 
+In `sh`, a temp file (better if fifo or fd) can be used instead of process substitution. And if it's acceptable to do it with waiting, try Here Documents.
 
 ### Rationale: