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