ultrix man page for system

system(3)						     Library Functions Manual							 system(3)

Name
       system - issue a shell command

Syntax
       system(string)
       char *string;

Description
       If  the	string	argument  is the NULL pointer (0) the function tests the accessibility of the command interpreter The function will return
       zero for failure to find the command interpreter, and positive if successful.

       If the string argument is non-NULL the routine causes the string to be given to as input as if the string had been typed as a command at  a
       terminal.  The current process waits until the shell has completed, then returns the exit status in the form that returns.

Diagnostics
       Exit status 127 indicates the shell couldn't be executed.

See Also
       execve(2), wait(2), popen(3)

																	 system(3)