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In Message-Id <86bpff6iw6.wl%kaz...@mse.biglobe.ne.jp>
        FURUSAWA Kazumi <kaz...@mse.biglobe.ne.jp>$B$5$s(Bwrites:
> $B8E_7$G$9!#G_K\$5$s!"2?ey$bczg...@bl@$7$F$/$...@$5$c$f!"$"$j$,$H$&$4$6$$$^$7$?!#(B

> $B:G8e$K!":#2s$N%m%8%C%/$K$D$$$F(B NetBSD 
> $B$N>l9g$NOCBj$,$"$j$^$7$?$N$G!"(B
> $B;29M$^$G$K!"B>$N(B OS $B$G$N3:Ev2U=j$r<($7$F$*$-$^$9!#(B

$B!!(Barp(8) $B$r8+$k$H!V(BThe arp utility appeared in 4.3bsd.$b...@$=(B
$B$&$J$N$G(B Unix Archive $B$+$i(B 4.3BSD $B$N(B source 
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$ ls -la 4.3BSD/src/etc/arp.c
-r--r--r-- 1 root   wheel  7199 Feb 22  1986 4.3BSD/src/etc/arp.c
$ cat -n 4.3BSD/src/etc/arp.c | tail -n +291 | head -7
   291                  if (hp)
   292                          host = hp->h_name;
   293                  else {
   294                          host = "?";
   295                          if (h_errno == TRY_AGAIN)
   296                                  bynumber = 1;
   297                  }

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