Finding your remote host's name

[Steve Mawer]

If I `rlogin' from machine1 to machine2, is there a simple and (relatively)
portable way to find out on machine2 the name of machine1?  I'd like to do
this from a shell script if possible, but I'm willing to write C code if
necessary.

I need this to run on ULTRIX V3 (DECsystem 3100), AIX V2 and V3 (RT PC and
RISC system/600), Unisys 5000 UTS and SCO Xenix on Compaqs using SCO TCP/IP
(and probably Excelan, but I'm not keen on this one :-().

-- 
Steve C. Mawer        <scm at datlog.co.uk> or < {backbone}!ukc!datlog!scm >
                       Voice:  +44 1 863 0383 (x2153)