Use more meaningful variable name for "bottles to go"

99bottles.sh

 
 main() {
     local TransitionLine    # transition line between verses
-    local nb                # beginning number
+    local togo              # bottles to go
     local mode=standard     # transition mode
     while true; do case $1 in
         --careless)     mode=careless; shift ;;
             careless)   echo "If one of those bottles should happen to fall" ;;
         esac
     )
-    nb=ninety-nine
-    while [ -n "$nb" ]; do
-        verse "$nb"
+    togo=ninety-nine
+    while [ -n "$togo" ]; do
+        verse "$togo"
         echo
-        nb=$(pred "$nb")
+        togo=$(pred "$togo")
     done | poeticize | grammar | punctuate | capitalize
 }