pidp11_run.sh

#!/usr/bin/env bash

B=$(tput bold)
N=$(tput sgr0)

function choose () {
echo """
${B}DEC operating systems:      Unices:              Demonstration programs:${N}
 0001    rsx11mplus          0102    211bsd       1001    idled
 0002    rsts7               0105    unix5        1002    blinky
 0003    rt11                0106    unix6
 0004    dos11               0107    unix7
 0005    ias                 0113    sysiii      ${B}Nankervis System:${N}
 0115    sysv                                     1000    nankervis
"""

  echo -n "Enter operating system number: "
  read INPUT
  validate
}

function validate () {
  if $(echo $INPUT | grep -qE '^[0-9]{4}$'); then
    SYS=$INPUT
  else
    choose
  fi
}

if [ $# -eq 1 ]; then
  INPUT=$1
  validate
else
  choose
fi

cd /opt/pidp11/bin
./pidp11.sh $((8#$SYS))