Executes a command using the system shell and captures its output.
Collects the output generated by a command executed by the system shell
The command supplied to this function will be executed by the system's shell, typically specified in the SHELL environment variable. There are many different system shells available with somewhat different behaviors, so the output generated by this function may vary between platforms.
command- The command that the shell should execute.
This documentation was imported from Asterisk Version SVN-branch-1.8-r403913