Thread: my script isn't running as a cronjob

i wrote myself little script give myself alert when system running low on memory. here script:

php code:

<?php
    $mem_string = exec('cat /proc/meminfo | grep memfree');
    $mem_string = str_ireplace('memfree:', '', $mem_string);
    $mem_string = trim(str_ireplace('kb', '', $mem_string));

    $mem_total = exec('cat /proc/meminfo | grep memtotal');
    $mem_total = str_ireplace('memtotal:', '', $mem_total);
    $mem_total = trim(str_ireplace('kb', '', $mem_total));
    
    if($mem_total > 0){
        $percentage = ($mem_string / $mem_total) * 100;
        if($percentage < 10){
            exec('notify-send " memory is low"');
        }
    }else{
        return;
    }
?>

it works fine when run:

code:

/usr/bin/php /home/jeff/memory_script.php

but when add
22 * * * * root /usr/bin/php /home/jeff/memory_script.php
/etc/crontab nothing - having in /var/log/syslog shows:

code:

aug 17 01:22:01 hardcore cron[986]: (*system*) reload (/etc/crontab)  aug 17 01:22:01 hardcore cron[29564]: (root) cmd (/usr/bin/php /home/jeff/memory_script.php)  aug 17 01:22:02 hardcore cron[29563]: (cron) info (no mta installed, discarding output)

have tried redirecting output file?

e.g. /usr/bin/php /home/jeff/memory_script.php &> /tmp/file.log

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