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diff --git a/os2/rcmd.h b/os2/rcmd.h
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+/* rcmd.h --- interface to executing commands on remote hosts
+   Karl Fogel <kfogel@cyclic.com> --- November 1995  */
+
+/* This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.  */
+
+/* Run the command CMD on the host *AHOST, and return a file descriptor for
+   a bidirectional stream socket connected to the command's standard input
+   and output.
+
+   rcmd looks up *AHOST using gethostbyname, and sets *AHOST to the host's
+   canonical name.  If *AHOST is not found, rcmd returns -1.
+
+   rcmd connects to the remote host at TCP port INPORT.  This should
+   probably be the "shell" service, port 514.
+
+   LOCUSER is the name of the user on the local machine, and REMUSER is
+   the name of the user on the remote machine; the remote machine uses this,
+   along with the source address of the TCP connection, to authenticate
+   the connection.
+
+   CMD is the command to execute.  The remote host will tokenize it any way
+   it damn well pleases.  Welcome to Unix.
+
+   FD2P is a feature we don't support, but there's no point in making mindless
+   deviations from the interface.  Callers should always pass this argument
+   as zero.  */
+extern int rcmd (const char **AHOST,
+		 unsigned short INPORT,
+		 char *LOCUSER,
+		 char *REMUSER,
+		 char *CMD,
+		 int *fd2p);