documentation/varnish/cli.md

Get Backend list and their status

varnishadm backend.list

Get value of a config parameter

varnishadm param.show http_resp_hdr_len

Set value of a config parameter

varnishadm param.set http_resp_hdr_len 16384

Ban URL

varnishadm ban req.http.host == example.com '&&' req.url '~' '/test/'

Get request detail filtered by ReqURL

varnishlog -q 'ReqURL eq "/test/"' -g request