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/usr/share/openmpi/help-mpi-btl-tcp.txt is in openmpi-common 1.4.3-2.1ubuntu3.

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The actual contents of the file can be viewed below.

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# -*- text -*-
#
# Copyright (c) 2009 Cisco Systems, Inc.  All rights reserved.
# $COPYRIGHT$
# 
# Additional copyrights may follow
# 
# $HEADER$
#
# This is the US/English help file for Open MPI's TCP support
# (the openib BTL).
#
[invalid if_inexclude]
WARNING: An invalid value was given for btl_tcp_if_%s.  This
value will be ignored.

  Local host: %s
  Value:      %s
  Message:    %s

[invalid minimum port]
WARNING: An invalid value was given for the btl_tcp_port_min_%s. Legal
values are in the range [1 .. 2^16-1]. This value will be ignored
(reset to the default value of 1024).

  Local host: %s
  Value:      %d