核心服務器上跑了一堆的腳本、程序，難免有時候會出現僵尸進程，死不死活不活的在那里占用資源，最初只是寫了個根據關鍵字查殺進程的linux shell腳本，后來發現很多時候進程死在那里的時候其實是內部調用子進程的時候出現了問題，這時候光殺父進程根本沒解決根本問題。比如說rsync的時候通過ssh來連接，rsync本身沒問題，但可能ssh死掉了。因此重新寫了腳本，遞歸查找子進程。

代碼如下:
#!/bin/sh
# 遞歸找到導致進程僵死的最底層子進程并殺除.
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