dhcpcd38
A wrapper for the dhcp client daemon.
Usage
dhcpcd <option>
<interface>
Overview
In Debian, the DHCP client daemon binary is called dhcpcd-bin and it is invoked via a wrapper called dhcpcd. Dhcpcd is normally invoked by ifup(8) but ifup only allows the setting of a limited number of dhcpcd command line flags. The dhcpcd wrapper reads extra flags from /etc/default/dhcpcd and then invokes dhcpcd-bin(8) It also adds the hostname as an argument to the command line, unless it is already set by ifup or /etc/default/dhcpcd or SET_HOSTNAME is configured. In that case there is no point in sending the old hostname with the DHCP request when it will be overridden by a new name supplied by the DHCP server.
Note that the interface argument must be supplied, there is no default to eth0 like the unadorned dhcpcd binary.