Created SC2161 (markdown)

SC2161.md

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+## Instead of '[ 1 ]', use 'true'.
+
+### Problematic code:
+
+    while [ 1 ]
+    do
+      echo "infinite loop"
+    done
+
+### Correct code:
+
+    while true
+    do
+      echo "infinite loop"
+    done
+
+### Rationale:
+
+This is a stylistic suggestion to use `true` instead of `[ 1 ]`. 
+
+`[ 1 ]` seems to suggest that the value "1" is somehow relevant to the statement. This is not the case: it doesn't matter. You can replace it with `[ 0 ]` or `[ wombat ]`, and it will still always be true.
+
+If you instead use `true`, the value is actually considered and can be inverted by replacing with `false`.
+
+On bash, you can also use `(( 1 ))`, which evaluates to true much like in C. `(( 0 ))` is similarly false.
+
+### Exceptions:
+
+None.