remux-hop

#!/bin/bash
#
# AutoSSH to host and create or connect to tmux session
# Multi-hop version. Separate hops with `%`. Assign port with `:`
#
# $ remux-hop server.example.com sysop
# $ remux-hop alice.example.com%bob.example.com sysop
# $ remux-hop alice.example.com%bob@bob.example.com:2222 sysop
#
# Author: Oystein Steimler <oystein@nyvri.net>

HLIST=$1;

IFS='%' read -a HOPS <<< "$HLIST"

AUTOSSHPRM="-M0 -o ServerAliveInterval=10 -o ServerAliveCountMax=2 -o BatchMode=yes"
SSHPRM="-A -t"
CMD="if tmux ls | grep ^$2; then tmux att -t $2; else tmux new -s $2;fi";
for ((i=${#HOPS[@]}-1; i>=1; i--))
do
  PCMD=$(printf %q "$CMD");

  ## Separate host from port
  IFS=':' read -a HOSTPARTS <<< "${HOPS[$i]}"
  HOP=${HOSTPARTS[0]}
  if [ -n "${HOSTPARTS[1]}" ]
  then
    echo "Setting port $PORT"
    PORT="-p ${HOSTPARTS[1]} ";
  fi

  ## Push a hop to the stack.
  CMD="if [ \`which autossh\` ] ; then echo 'AutoSSH $HOP $PORT'; autossh $AUTOSSHPRM $SSHPRM $PORT $HOP $PCMD; else echo 'SSH $HOP $PORT'; ssh $SSHPRM $PORT $HOP $PCMD; fi ";
done

#echo $CMD;
#exit;

if [ `which autossh` ];
then
  echo AutoSSH;
  autossh $AUTOSSHPRM $SSHPRM ${HOPS[$i]} $CMD;
else
  echo SSH;
  ssh $SSHPRM ${HOPS[0]} $CMD;
fi;