使用PHP删除单个cron作业

Question

I am using a php command to set up a cron job

<?php
   echo exec('echo -e "`crontab -l`\n* * * * *  /usr/local/bin/curl path" | crontab -');
?>

above command will add cronjob but i want to remove particular cronjob of given path so i have tried

<?php
 echo exec('echo -e "`crontab -r`\n1 * * * *  /usr/local/bin/curl path" | crontab -');
 ?>

but it's delete all cronjobs with email id.Is there any way to delete particular cron job?

Answer 1

As you found out, crontab -r removes all cron jobs, to remove one cron tab something like this would probably work:

<?php
// php is weird sometimes
// the output is an array split on new lines
exec('crontab -l', $data);
// this is the one you are replacing
$val = '*/30 * * * * /path/to/awstats.pl -update -config=myconfig';
// find it in the array
$key = array_search($del_val, $data);
// key is false if not found
if($key !== false){
  unset($data[$key]);
}
// put the data back into the crontab
exec ('echo "'.implode("\n", $data).'" | crontab -');

Answer 2

$match = 'yourpath';
exec('crontab -l 2>&1 | grep -v '.$match.' |  sort - | crontab -');

This lists the crontab, matches everything except the line you want deleted, and then pipes this match back in to create a new crontab.