pageにタグを付ける事ができる。

{{tag>tag1 tag2 tag3}}

 with namespaces: {{tag>ns1:tag1 ns1:tag2 ns2:subns1:tag3}}

参考サイト
https://www.dokuwiki.org/plugin:tag

これで

{{topic>Unixコマンド +ファイル操作&header&table&nouser&tags&sort}}

{{topic>tag1 -tag2}} – Lists all pages tagged with tag1 but not with tag2.
{{topic>tag1 +tag2}} – Lists all pages tagged with tag1 and tag2.
{{topic>tag1 tag2}} – Lists all pages tagged with either tag1 or tag2 or both.
{{topic>ns1?tag1 tag2}} – List all pages inside namespace ns1 tagged with either tag1 or tag2
{{topic>.?tag1 tag2}} – List all pages inside the current namespace tagged with either tag1 or tag2
{{topic>tag1 tag2 tag3&nodate&desc&sort}} (Adding pagelist options to change the design

下記のようになる

これで

{{count>[tag]}}

こうなる

{{count>+}} – List all tags with related occurrences.
{{count>tag1 tag2}} – List the occurrence of tag1 and tag2.
{{count>tag1 tag2 tag3&. ns1 ns2}} – List all occurrences for the given tags inside the namespaces (the dot specifies the root namespace)