This is the standard C library system() function
from stdlib.h.
int system(const char *string);
system() passes the string pointed to
by string to the host environment to
be executed by a command processor in an implementation-defined
manner. A null pointer can be used for string,
to inquire whether a command processor exists.
If the argument is a null pointer, the system function returns
nonzero only if a command processor is available.
If the argument is not a null pointer, the system() function
returns an implementation-defined value.
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