dhclient私はDebian（isc-dhcp-client、）を使用していますisc-dhcp-common。
記録されたログにはdhclient著作権情報やその他の役に立たないものがいっぱいです（「Readmeを参照してください」、「http://...にアクセスしてください」）。
簡単なdhcpセッションは次のとおりです。
dhclient: Internet Systems Consortium DHCP Client 4.2.2
dhclient: Copyright 2004-2011 Internet Systems Consortium.
dhclient: All rights reserved.
dhclient: For info, please visit https://www.isc.org/software/dhcp/
dhclient:
dhclient: Listening on LPF/wlan0/aa:bb:cc:dd:ee:ff
dhclient: Sending on LPF/wlan0/aa:bb:cc:dd:ee:ff
dhclient: Sending on Socket/fallback
dhclient: DHCPRELEASE on wlan0 to 192.168.0.1 port 67
dhclient: send_packet: Network is unreachable
dhclient: send_packet: please consult README file regarding broadcast address.
dhclient: Internet Systems Consortium DHCP Client 4.2.2
dhclient: Copyright 2004-2011 Internet Systems Consortium.
dhclient: All rights reserved.
dhclient: For info, please visit https://www.isc.org/software/dhcp/
dhclient:
dhclient: Listening on LPF/wlan0/aa:bb:cc:dd:ee:ff
dhclient: Sending on LPF/wlan0/aa:bb:cc:dd:ee:ff
dhclient: Sending on Socket/fallback
dhclient: DHCPRELEASE on wlan0 to 192.168.0.1 port 67
dhclient: send_packet: Network is unreachable
dhclient: send_packet: please consult README file regarding broadcast address.
dhclient: Internet Systems Consortium DHCP Client 4.2.2
dhclient: Copyright 2004-2011 Internet Systems Consortium.
dhclient: All rights reserved.
dhclient: For info, please visit https://www.isc.org/software/dhcp/
dhclient:
dhclient: Listening on LPF/wlan0/aa:bb:cc:dd:ee:ff
dhclient: Sending on LPF/wlan0/aa:bb:cc:dd:ee:ff
dhclient: Sending on Socket/fallback
dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7
dhclient: DHCPREQUEST on wlan0 to 255.255.255.255 port 67
dhclient: DHCPOFFER from 192.168.0.1
dhclient: DHCPACK from 192.168.0.1
dhclient: bound to 192.168.0.16 -- renewal in 36865 seconds.
重要な情報にジャンクが混在しています。重要なログ（含む）を渡しdhclientてバックグラウンドに表示するため、これが問題になります。リースは頻繁に更新されるため、dhclientログはすばやく長くなる可能性があります。その後、別のログを表示するには上にスクロールする必要があります。
ジャンクを隠して関連情報だけを保存することは可能ですか？