#!/bin/sh

COMMAND="plzip -cv9"

# wait to start
while : ; do
  PLZIP_PID=$(pgrep -f "$COMMAND")
  EXITCODE=$?
  [ $EXITCODE -eq 0 ] && break
  sleep 1s
done

# start
while : ; do
  PLZIP_PID=$(pgrep -f "$COMMAND")
  EXITCODE=$?
  [ $EXITCODE -ne 0 ] && break
  echo -e "$(date -u)\t$(ps -T -o pid= -p $PLZIP_PID | wc -l)"
  sleep 1s
done