shell脚本递归查杀子进程与僵尸进程

#!/bin/sh
# 递归找到导致进程僵死的最底层子进程并杀除.
ParentProcessID=$1;
if [ "x${ParentProcessID}" = "x" ] ; then
    echo "Please Supply the top Parent Process ID to be killed!"
    echo "Usage:sh $0 PID [-v]"
    echo "PID The Parent Process ID as root"
    echo "-v is this argument supplied,no real kill operation will be performed,only process tree be show."
    exit 1
fi
let IsRealKillDo=1;
if [ "x$2" = "x-v" ] ; then
    let IsRealKillDo=0;
fi
echo "Begin Kill the Leaf Process of process ${ParentProcessID}" >&2
killpidList=""
function loopNextSubProcess(){
    local nParentProcessID=$1
    local tmpPidList=""
    tmpPidList=`ps -A --format='%p%PisParent' --width 2048 -w --sort pid|grep "${nParentProcessID}isParent"|grep -v grep|grep -v "$$" | awk '{ printf $1 }'`
    ps --format='%p%P%a' --width 2048 -w -p ${nParentProcessID}|grep -v grep|grep -v "$$" >&2
    if [ "x${tmpPidList}" = "x" ] ; then
        echo "****Got One Leaf = [${nParentProcessID}]****" >&2
        killpidList="${killpidList}n${nParentProcessID}"
        return
    fi
    for theNextPid in ${tmpPidList} ; do
        loopNextSubProcess ${theNextPid}
    done
}
loopNextSubProcess ${ParentProcessID}
if [ ${IsRealKillDo} -eq 1 -a "x${killpidList}" != "x" ] ; then
    for curpid in `echo -e ${killpidList}` ; do
        if [ "x${curpid}" != "x" ] ; then
            echo "kill -9 ${curpid}"
            kill -9 ${curpid}
        fi
    done
else
    echo -e ${killpidList}
fi