The function call also be used with NULL as argument to check whether a command processor exists.
- C string containing the system command to be executed.
Return ValueThe value returned when the argument passed is not NULL, depends on the running environment specifications. In many systems, 0 is used to indicate that the command was succesfully executed and other values to indicate some sort of error.
When the argument passed is NULL, the function returns a nonzero value if the command processor is available, and zero otherwise.
PortabilityThe behavior and return value are platform-dependent.
|exit||Terminate calling process (function)|