#!/bin/sh
echo "father pid $PPID"
grandpaPid=`ps -f $PPID | awk ‘{if (NR==2) print $3}‘`
echo "grandpa pid $grandpaPid"
grandpaName=`head -n 1 /proc/$grandpaPid/status | awk ‘{print $2}‘`
echo "my grandPa Name : <$grandpaName>"原文：https://blog.51cto.com/yaxinsn/2396453