使用python调用shell判断当前进程是否存在

使用subprocess模块判断当前进程是否存在

#! /usr/bin/env python
import subprocess

res = subprocess.Popen(r'ps -ef |grep java |grep -v grep |wc -l',
                       shell=True,
                       # 正确值
                       stdout=subprocess.PIPE,
                       # 错误值
                       stderr=subprocess.PIPE,)

# 在windows 中需要使用 decode("gbk")
PID_tomcat_ADP=int(res.stdout.read().decode("utf-8").strip())

if PID_tomcat_ADP != 1:
   shell_start = subprocess.Popen(r'/bin/sh /usr/local/tomcat/start.sh',
                       shell=True,
                       stdout=subprocess.PIPE,
                       stderr=subprocess.PIPE,)