r('', <<'/proc/net/dev' Inter-| Receive | Transmit face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed These eth interfaces show up: eth0: eth1: eth2: eth3: lo: All other stuff is being ignored eth99: eth100 is not actually available: ethBAD: this one's now allowed either /proc/net/dev ); expect load('base') . <<'IFACES'; iface eth1 inet manual iface eth2 inet manual iface eth3 inet manual IFACES 1;