Updated SC2010 (markdown)

SC2010.md

@@ -3,22 +3,42 @@
 ### Problematic code:
 
 ```sh
-ls /directory | grep target_file_pattern
+ls /directory | grep mystring
+```
+
+or
+
+```sh
+rm $(ls | grep -v '\.c$')
 ```
 
 ### Correct code:
 
 ```sh
-ls /directory/target_file_pattern
+echo /directory/*mystring*
 ```
+
+or
+
+```sh
+# BASH
+shopt -s extglob
+rm -- !(*.c)
+
+# POSIX
+for f in ./*
+do
+  case $f of
+    *.c) true;;
+    *) rm "$f";;
+  esac
+done
+```
+
 ### Rationale:
 
-Matching non-alphanumeric characters with grep may require escaping.  Typically it is cleaner to use the built in pattern matching or another command like `find`
+[Parsing ls](https://mywiki.wooledge.org/ParsingLs) is generally a bad idea because the output is fragile and human readable. To better handle non-alphanumeric filenames, use a glob. If you need more advanced matching than a glob can provide, use a `for` loop.
 
 ### Exceptions:
 
-Matching the negative list.
+None
-
-```sh
-ls /directory | grep -v NOT_target_file_pattern
-```