Cron作业无法在Raspberry中运作

Question

I want to add a cron job in my Raspberry to execute a task every five minutes. So I do in the terminal:

crontab -e

and then add at the file:

*/1 * * * * /usr/bin/php myscript path.

The script is something very simple. just to try if it works:

 <?php
$myfile = fopen("newfile.txt", "w") or die("Unable to open file!");
$txt = date("l jS \of F Y h:i:s A") . "<br>";;
fwrite($myfile, $txt);
fclose($myfile);
?>

The problem is that the date isn't updated, so the cron job doesn't work. Any idea of the problem ?

UPDATE

This what I got, when I execute crobtab -e

    GNU nano 2.2.6        File: /tmp/crontab.3IXg0z/crontab                       

# 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
* * * * * /usr/bin/php /full/path/myscript.php

Answer 1

First, make sure the script is executable:

chmod +x /path/to/some/script.php

Second, make sure your script has an appropriate #! (or "shebang" ) on the very first line:

#!/usr/bin/php

Then make sure your cron job is configured correctly. The format for cron is typically mh dom mon dow command

sudo crontab -e

*/5 * * * * /path/to/some/script.php

Answer 2

如果要每5分钟运行一次脚本，则应添加此条目。

*/5 * * * * /usr/bin/php /full/path/to/php/script.php

Answer 3

Make sure you have PATH variable set correctly on crontab, so it can locate your file.

You can simple put following line in top of crontab

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/path/to/newfile.txt

Try, following test

* * * * * touch /tmp/hello

Do following to redirect result

*/5 * * * * /usr/bin/php /full/path/to/php/script.php > /tmp/out.txt

Make sure your script running on command line.

/usr/bin/php /full/path/to/php/script.php

Use the -f option to execute the script:

*/5 * * * * /usr/bin/php -f /full/path/to/php/script.php

Tail logs file to see its executing every 5 min

tail -f /var/log/cron