Shell脚本实现温和方式重启Centos系统

主要目的是用于重启后台比较重要的进程，如果采用killall -9强制kill掉，可能会引起问题。比如数据库进程。代码如下：

#!/bin/sh

if [ -z "$1" ]; then

   /bin/echo "$0 <command line>"

   exit 1

fi

param=''

list='2 3 4 5 6 7 8 9'

for i in $list; do

   eval p='$'$i

   if [ -z $p ]; then

break

   fi

   param="$param $p"

done
if [ -f /bin/awk ]; then

   AWK=/bin/awk

else

   AWK=/usr/bin/awk

fi
if [ -f /bin/grep ]; then

   GREP=/bin/grep

else

   GREP=/usr/bin/grep

fi
program=`/bin/echo $1 | $AWK -F '/' '{print $NF;}'`

count=`/bin/ps auxww | $GREP -w $program | $GREP -v grep | /usr/bin/wc -l`

if [ $count -gt 0 ]; then

   i=0

   /bin/echo "stopping $program ..."

   while [ 1 -eq 1 ]; do

if [ $i -eq 0 ]; then

   /usr/bin/killall $program

else

   /usr/bin/killall $program >/dev/null 2>&1

fi
if [ $? -ne 0 ]; then

   break

fi
/usr/bin/printf .

/bin/sleep 1

let i=$i+1

   done

fi
/bin/echo ""

count=`/bin/ps auxww | $GREP -w $program | $GREP -v grep | $GREP -v $0 | /usr/bin/wc -l`

if [ $count -eq 0 ]; then

   /bin/echo "starting $program ..."

   exec $1 $param

else

   /bin/ps auxww | $GREP -w $program | $GREP -v grep | $GREP -v $0

   /bin/echo "already running $program count: $count, restart aborted!"

fi