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#compdef iftop

_interfaces () {
  local disp expl sep
  _description interfaces expl 'network interface'
  _net_interfaces "$expl[@]"
  if zstyle -t ":completion:${curcontext}:interfaces" verbose; then
    zstyle -s ":completion:${curcontext}:interfaces" list-separator sep || sep=--
    disp=( "any $sep capture on all interfaces" )
    compadd "$expl[@]" -ld disp any
  else
    compadd "$expl[@]" any
  fi
}

_arguments \
  '(-h -n -N -p -b -B -P -i -f -F -c)'-h'[print a summary of usage]' \
  -n"[don't do hostname lookups]" \
  -N"[don't resolve port number to service names]" \
  -p'[run in promiscuous mode]' \
  -P'[turn on port display]' \
  -b"[don't display bar graphs of traffic]" \
  -B'[display bandwidth rates in bytes/sec rather than bits/sec]' \
  '-i+[interface]:network interface:_interfaces' \
  '-f+[filter]:BPF filter' \
  '-F+[net/mask]:network/mask' \
  '-c+[config file]:config file:_files'