判断进程是否存在，并杀死该进程

杀死多个名为my_server的进程：

PIDS=`ps -ef | grep my_server | awk '{print $2}'`
for pid in $PIDS
do
  kill -9 $pid
done

判断主从进程my_server是否存在，存在就杀死所有my_server进程

#!/bin/sh
isServerExist=`ps -ef|grep -m 1 my_server|grep -v "grep"|wc -l`
if [ "$isServerExist" = "0" ]; then
	echo "my_server not found"
#	exit;
elif [ "$isServerExist" = "1" ]; then
	pid=`ps -ef|grep -m 1 my_server | awk '{print $1}'`
	kill $pid
fi

注：grep -v "grep" 去掉grep进程，wc -l 返回行数