diff --git a/bb.sh b/bb.sh
index f6ccd83..5a17e4a 100755
--- a/bb.sh
+++ b/bb.sh
@@ -776,6 +776,14 @@ tags_in_post() {
     sed -n "/^<p>$template_tags_line_header/{s/^<p>$template_tags_line_header//;s/<[^>]*>//g;s/[ ,]\+/ /g;p}" $1
 }
 
+# Finds all posts referenced in a number of tags.
+# Arguments are tags
+# Prints one line with space-separated tags to stdout
+posts_with_tags() {
+    tag_files="$(echo "$@" | sed "s/\S\+/tag_&.html/g")"
+    sed -n '/^<h3><a class="ablack" href="[^"]*">/{s/.*href="\([^"]*\)">.*/\1/;p}' $tag_files
+}
+
 # Rebuilds tag_*.html files
 # if no arguments given, rebuilds all of them
 # if arguments given, they should have this format: