The Linux one doesn't have an example anywhere of how to assign an IP address to an interface. Which is probably the most basic thing that you would be looking for.
which says "This program is obsolete! For replacement check ip addr and ip link" and references ip(8) in the See Also section. Neither page refers to ip-address. In fact that entry doesn't exist on die.net which seems to be what Google considers to be the authoritative source for Linux man pages.
http://man.openbsd.org/ifconfig.8
https://linux.die.net/man/8/ip
The Linux one doesn't have an example anywhere of how to assign an IP address to an interface. Which is probably the most basic thing that you would be looking for.