dhcpcd - a wrapper for the DHCP client daemon.
dhcpcd <option> <interface>
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
Note that the interface argument must be supplied, there is no default
to eth0 like the unadorned dhcpcd binary.
Simon Kelley <firstname.lastname@example.org>