Look at incoming requests for URL
varnishlog -c -m RxURL:"/somepage.html"

Look at requests made to the backend for URL
varnishlog -b -m TxURL:"/somepage.html"

Requests for one specific host
varnishlog -c -m RxHeader:"Host: somehost.com"

See cache age for a specific host
varnishlog -c -m RxHeader:"Host: somehost.com" | grep Age

Test VCL compilation
varnishd -C -f /path/to/file.vcl

Ban all URLs
varnishadm -S /path/to/secret -T :6082 "ban.url /"

View Ban List
varnishadm -S /path/to/secret -T :6082 "ban.list"

Real time URLs being sent to backend
varnishtop -b -i TxURL

List backend traffic
varnishlog -b -o

List URLs going to backend
varnishlog -b -o -i TxURL | grep TxURL | awk '{print $4}'