System( )
Executes an operating system command
System(command)
Executes a command in the underlying operating system. If the command itself executes but is in error, and if there exists a priority n+101 (where n is the current priority), the execution of the dialplan will continue at that priority level.
This application is very similar to the trySystem( ) application, except that it will return -1 if it is unable to execute the system command, whereas the trySystem( ) application will always return 0.
exten => 123,1,System(echo hello > /tmp/hello.txt)