Linux下通过grep查找指定的进程是否存在

# 查找指定进程的PID
find_name=s_app # s_app是要查找的进程名称
pid_val=`ps -ef | grep $find_name | grep -v grep | awk '{print $2}'`
if [ $pid_val > 0 ]
then
    echo "查找的进程存在,对应的PID=${pid_val}"
else
    echo "查找的进程不存在"
fi

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
<p>// 查找指定进程的PID号并返回
int find_pid(const char <em>app_name)
{
char cmd_buff[100];
int cnt;
sprintf(cmd_buff,"ps -ef | grep %s | grep -v grep | awk '{print $2}'",app_name);
FILE </em>fp=popen(cmd_buff,"r");
if(fp==NULL)
{
return -1;
}
cnt=fread(cmd_buff,1,sizeof(cmd_buff)-1,fp);
cmd_buff[cnt]='\0';
pclose(fp);
// 判断是否读取到数据
if(cnt==0)
{
return 0;
}
return atoi(cmd_buff);
}</p><p>int main(int argc,char **argv)
{
int pid;
// 填入要查找的应用程序名称
pid=find_pid("s_app");
if(pid==-1)
{
printf("查找错误,查找程序未能启动.\n");
}
else if(pid==0)
{
printf("查找的进程不存在.\n");
}
else
{
printf("查找的进程PID=%d\n",pid);
}
return 0;
}

# 查找指定进程的PID
find_name=s_app
while :
do
pid_val=<code>ps -ef | grep $find_name | grep -v grep | awk '{print $2}'
if [ ${pid_val} > 0 ]
then
echo "查找的进程存在"
else
echo "查找的进程不存在"</p><h1>重新启动</h1><pre class="brush:php;toolbar:false;"><code>    /mnt/hgfs/linux-share-dir/linux_c/s_app 8080 &
fi
sleep 10</code>

grep -q "/home/wbyq/find_pid.sh &" /home/wbyq/.profile||echo "/home/wbyq/find_pid.sh &" >> /home/wbyq/.profile