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/^[[:blank:]]*(iface|mapping|auto|allow-[^ ]+|source) / {
s_iface = 0
}
$1 == "auto" { print $2 >> auto_interfaces; next }
$1 == "iface" {
s_iface = 1
iface = $2
next
}
s_iface == 1 {
if ($1 == "bridge_ports") {
for (i = 2; i <= NF; i++) {
if ($i == interface) {
print iface >> bridge_interfaces
break
}
}
}
}
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