php - Run shell command and send output to file? -

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i need able modify openvpn auth file via php script. have made http user no-pass sudoer, machine available within home network.

i have following commands:

echo shell_exec("sudo echo '".$username."' > /etc/openvpn/auth.txt"); echo shell_exec("sudo echo '".$password."' >> /etc/openvpn/auth.txt");

but when run, not change file @ all, or provide output in php.

how make work?

when run 

sudo command > file

only command run sudo, not redirection.

as pointed out, sudo sh -c "command > file" work. unless, want run command sudo, should not it. can run redirection part sudo. answer rici covers 2 methods it. here method:

command | sudo tee filename >/dev/null #to overwrite (command > file) command | sudo tee -a filename >/dev/null # append (command >> file)

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