使用crontab，每3个应该在引导时运行的python程序中就有一个没有运行

Question

下面的脚本和配置是在Raspberry Pi B+ (我相信)上运行的。

脚本'check.py‘如下

#!/usr/bin/env/ python3
import time
print('sleeping')
time.sleep(15)
print('HEASPIDHAPOISHDOAISHD')

def emailChecker():
    import imaplib
    import email
    import os
    import time
    print('initiating emailinfiniteCheck')

    EMAIL = 'CENSORED@gmail.com'
    PASSWORD = 'CENSORED'
    SERVER = 'imap.gmail.com'
    FROM = 'CENSORED'
    # connect to the server and go to its inbox
    mail = imaplib.IMAP4_SSL(SERVER)
    mail.login(EMAIL, PASSWORD)
    while True:
        try:
            mail.select('inbox')
            status, data = mail.search(None, 'ALL')
            mail_ids = []
            for block in data:
                mail_ids += block.split()
            for i in mail_ids:
                status, data = mail.fetch(i, '(RFC822)')
                for response_part in data:
                    refuse = False
                    if isinstance(response_part, tuple):
                        message = email.message_from_bytes(response_part[1])
                        mail_from = message['from']
                        mail_subject = message['subject']
                        mail_date = message['date']
                        if message.is_multipart():
                            mail_content = ''
                            for part in message.get_payload():
                                if part.get_content_type() == 'text/plain':
                                    mail_content += part.get_payload()
                        else:
                            mail_content = message.get_payload()
                            mail_content = message.get_payload()
                        position = 0
                        for i in mail_from:
                            if i == '<':
                                change = True
                                firstPos = position + 1
                            if i == '>':
                                change = True
                                lastPos = position
                            position = position + 1
                        mail_from = (mail_from[firstPos:lastPos])
                        myFile = open('/home/pi/GLaDOS/text-files/read_messages.txt', 'rt')
                        for i in myFile:
                            i = i.replace('\n', '')
                            if i == mail_date:
                                refuse = True
                        myFile.close()
                        if refuse == False:
                            myFile = open('/home/pi/GLaDOS/text-files/read_messages.txt', 'a')
                            myFile.write(mail_date)
                            myFile.close()

                            myFile = open('/home/pi/GLaDOS/text-files/command.txt', 'wt')
                            myFile.write(str(mail_subject))
                            myFile.close()

                            time.sleep(60)
        except Exception as e:
            print('error, retrying', e)
print('well I got here...')
emailChecker()

(注意:我已经审查了一些部分，如我的电子邮件，密码和ifttt密钥，以防止任何不必要的恶作剧(；)(另一个注意:您可能不需要查看除‘check.py’以外的任何其他程序)

我正在使用crontab运行三个单独的python脚本，每个脚本的输出都通过管道输出到一个日志文件中，这三个python脚本中只有一个与输出一起运行。

这是crontab文件：

# Edit this file to introduce tasks to be run by cron.
# 
# Each task to run has to be defined through a single line
# indicating with different fields when the task will be run
# and what command to run for the task
# 
# To define the time you can provide concrete values for
# minute (m), hour (h), day of month (dom), month (mon),
# and day of week (dow) or use '*' in these fields (for 'any').
# 
# Notice that tasks will be started based on the cron's system
# daemon's notion of time and timezones.
# 
# Output of the crontab jobs (including errors) is sent through
# email to the user the crontab file belongs to (unless redirected).
# 
# For example, you can run a backup of all your user accounts
# at 5 a.m every week with:
# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
# 
# For more information see the manual pages of crontab(5) and cron(8)
# 
# m h  dom mon dow   command
@reboot sleep 60 && sh /home/pi/GLaDOS/launcherCheck.sh >/home/pi/logs/check.log 2>&1
@reboot sleep 60 && sh /home/pi/GLaDOS/test.sh >/home/pi/logs/test.log 2>&1
@reboot sleep 60 && sh /home/pi/GLaDOS/launcherGLaDOS.sh >/home/pi/logs/GLaDOS.log 2>&1

crontab文件打开三个不同的.sh文件(如下所示)，它们都是使用‘chmod755name.sh’配置的。

.sh文件'test.sh‘-

#!/bin/sh
# launcherGLaDOS.sh
# navigate to home directory, then to this directory, then execute python script, then back home

cd /
cd home/pi/GLaDOS
sudo python3 test.py
cd /

.sh文件'launcherGLaDOS.sh‘-

#!/bin/sh
# launcherGLaDOS.sh
# navigate to home directory, then to this directory, then execute python script, then back home

cd /
cd home/pi/GLaDOS
sudo python3 GLaDOS.py
cd /

.sh文件'launcherCheck.sh‘-

#!/bin/sh
# launcher.sh
# navigate to home directory, then to this directory, then execute python script, then back home

cd /
cd home/pi/GLaDOS
sudo python3 check.py
cd /

(注:我之所以将时间延迟，是因为有人猜测，到那时，并不是所有的覆盆子pi上的服务都已经开始)

我没有收到错误消息，程序似乎没有运行-我之所以知道这一点，是因为我检查了每个日志文件(https://i.stack.imgur.com/znqJh.png)的输出，正如您所看到的，两个脚本都可以工作，但emailCheck没有。

当不在crontab中时，这些程序都可以工作。

另一件值得注意的事情是，在重新格式化sd卡后，程序似乎可以正常工作(尽管是通过rc.local)，因此我开始怀疑sd卡是否有某种退化-但因为我对树莓派知之甚少，我认为这可能是最好的去处。

欢迎所有和任何解决方案，

马修。

Answer 1

解决了！

程序正在运行，判断它是否正在运行的唯一方法是打印到shell --我没有查看shell。解决方案是使用(import logger)将日志写入一个文件，这意味着我可以只检查一个文件，看看脚本是否正在运行。