Move main execution to main()

99bottles.sh

     echo $n
 }
 
+main() {
+    standardBreakLine="Take one down and pass it around"
+    wastefulBreakLine="If one of those bottles should happen to fall"
+    breakLine=$([ "$1" = --careless ] \
+     && echo $wastefulBreakLine \
+     || echo $standardBreakLine)
+
+    nb=ninety-nine
+
+    while [ -n "$nb" ]; do
+        verse $nb
+        echo
+        nb=$(pred $nb)
+    done | poeticize | grammar | punctuate | capitalize
+}
 
-standardBreakLine="Take one down and pass it around"
-wastefulBreakLine="If one of those bottles should happen to fall"
-breakLine=$([ "$1" = --careless ] \
- && echo $wastefulBreakLine \
- || echo $standardBreakLine)
-
-nb=ninety-nine
-
-while [ -n "$nb" ]; do
-    verse $nb
-    echo
-    nb=$(pred $nb)
-done | poeticize | grammar | punctuate | capitalize
+main "$@"