wait_until_done.sh

#!/bin/bash
#
# USAGE: wait_until_done PID
#
# wait_until_done watches a process passed in as the first argument waits until
# it finishes
#

# Print the header comment from this file, ducking the shebang line, and stopping a the first line that doesn't start with a hash
function print_header_comment {
        awk '/^# / { print substr( $0, 3 ) }; $0 !~ /^#/ { exit }' $0
}

# Print Usage or Execute
if [ $# == 0 ]; then
  print_header_comment
else

  PID=$1

  while kill -0 $PID 2> /dev/null; do
    sleep 10
  done

  echo
  echo "Process $PID finished..."
  echo
fi