/usr/share/doc/ppp/examples/scripts/ppp-on-rsh is in ppp 2.4.5-5ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#
# A sample script to establish PPP session(s) via rsh
#
# Adi Masputra <adi.masputra@sun.com>
# Jan 24, 2000
#
#
# You'd definitely want to change the following addresses to suit
# your network configuration
#
LOC_IP=10.0.0.1
REM_IP=10.0.0.2
NETMASK=255.255.0.0
export LOC_IP REM_IP
#
# This is the remote peer where in.rshd is running, either
# its hostname or IP address
#
PPPD_RHOST=myremotehost
#
# For this example, we assume that pppd on both local and remote
# machines reside in the same place, /usr/local/bin/pppd
#
PPPD_LOC=/usr/local/bin/pppd
#
# The location of local options file (where rsh client is running).
# Note that the sample options file included in the distribution
# may need further customizations, depending on your needs. The 'noauth'
# option specified in the file is there to simplify the example. In
# reality, you'd probably want to remove such option.
#
PPPD_LOC_OPT=/etc/ppp/options-rsh-loc
#
# The location of remote options file (where in.rshd daemon is running).
# Note that the sample options file included in the distribution
# may need further customizations, depending on your needs. The 'noauth'
# option specified in the file is there to simplify the example. In
# reality, you'd probably want to remove such option. Also note that
# the remote options file need to include the 'notty' option for this
# to work
#
PPPD_REM_OPT=/etc/ppp/options-rsh-rem
#
# The location of rsh client on the local machine
#
RSH_LOC=/bin/rsh
export PPPD_LOC PPPD_LOC_OPT PPPD_REM_OPT PPPD_RHOST RSH_LOC
#
# Uncomment the following to enable IPv6, note that the IPv6 support
# needs to be enabled during compilation
#
# PPPD_IPV6='+ipv6 ipv6cp-use-ipaddr'
export PPPD_IPV6
#
# And execute pppd with the pty option, specifying rsh client as the
# slave side of the pseduo-tty master/slave pair.
#
exec $PPPD_LOC \
pty '$RSH_LOC $PPPD_RHOST $PPPD_LOC $REM_IP:$LOC_IP $PPPD_IPV6 file $PPPD_REM_OPT' \
$LOC_IP:$REM_IP netmask $NETMASK $PPPD_IPV6 file $PPPD_LOC_OPT
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