cron - running crontab via web gives error that nobody does not have access to run crontab -

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i'm having such hard time getting work. have looked on place. here's situation.

i'm hosting in shared environment. dynamically creating crontab file , trying execute using exec command. runs fine when via telnet when run php file runs exec command, error saying

"you (nobody) not allowed use program (/usr/bin/crontab)"

how make sure (nobody) have access run crontab command.

the sysadmin might have forbidden use of cron listing user nobody in /etc/cron.deny.


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