Update sni-crawler.sh

sni-crawler.sh

@@ -10,7 +10,7 @@
 #
 # $1 - URL to crawl
 # $2 - IP addresses to crawl through, comma-separated (no spaces)
-# $3 - depth levels (wget's "-l" flag, basically)
+# $3 - depth levels (wget's "-l" flag, basically; optional, default: 2)
 
 CRAWLURL="$1"
 CRAWLDOMAIN="$( echo "$CRAWLURL" | sed -r -e 's#^https?://([^/]+)/.*#\1#' )"
@@ -18,7 +18,7 @@ CRAWLDOMAIN="$( echo "$CRAWLURL" | sed -r -e 's#^https?://([^/]+)/.*#\1#' )"
 # TODO: reality checks
 CRAWLIPS="${2//,/ }"
 
-CRAWLDEPTH="$3"
+CRAWLDEPTH="${3:-2}"
 
 CRAWLDIR="$( mktemp -d "/tmp/$0".XXXX )"