Updated Optional (markdown)

Optional.md

@@ -41,6 +41,11 @@ desc:    Suggest adding a default case in `case` statements
 example: case $? in 0) echo 'Success';; esac
 fix:     case $? in 0) echo 'Success';; *) echo 'Fail' ;; esac
 
+name:    avoid-negated-conditions
+desc:    Suggest removing unnecessary comparison negations
+example: [ ! "$var" -eq 1 ]
+fix:     [ "$var" -ne 1 ]
+
 name:    avoid-nullary-conditions
 desc:    Suggest explicitly using -n in `[ $var ]`
 example: [ "$var" ]
@@ -80,4 +85,10 @@ name:    require-variable-braces
 desc:    Suggest putting braces around all variable references
 example: var=hello; echo $var
 fix:     var=hello; echo ${var}
+
+name:    useless-use-of-cat
+desc:    Check for Useless Use Of Cat (UUOC)
+example: cat foo | grep bar
+fix:     grep bar foo
+
 ```