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hello, 
 
I have orange pi one. I have installed php and it is working ok. the only problem is that I cant run commands using exec(), shell_exec().  
I have tried simple commands like exec("ls"), exec(" echo 'hello' ") but it will not show it. 
i have tried to clear all the disabled_functions in the php.ini in /etc/php5/apache2/php.ini 
 
nothing worked for me. 
 
what can I do? 
 
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