how to execute Linux command in php?

[Anon]

my system : Linux+apache+php
i want to execute Linux command in php file ,how to do this?

[Anon]

exec($string) executes an external program.
passthru($string) executes program and displays raw output.
system($string) executes program and displays output.

(where $string is the command line you want to call).

Does that help?

[Anon]

thanks a lot.