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SYSTEM(3)		 BSD Library Functions Manual		     SYSTEM(3)

NAME
     system -- pass a command to the shell

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <stdlib.h>

     int
     system(const char *string);

DESCRIPTION
     The system() function hands the argument string to	the command inter-
     preter sh(1).  The	calling	process	waits for the shell to finish execut-
     ing the command, ignoring SIGINT and SIGQUIT, and blocking	SIGCHLD.

     If	string is a NULL pointer, system() will	return non-zero, if the	com-
     mand interpreter is available, or zero if none is available.  Otherwise,
     system() returns the termination status of	the shell in the format	speci-
     fied by waitpid(2).

RETURN VALUES
     If	a child	process	cannot be created, or the termination status of	the
     shell cannot be obtained, system()	returns	-1 and sets errno to indicate
     the error.	 If execution of the shell fails, system() returns the termi-
     nation status for a program that terminates with a	call of	exit(127).

SEE ALSO
     sh(1), execve(2), waitpid(2), popen(3), shquote(3)

STANDARDS
     The system() function conforms to ANSI X3.159-1989	("ANSI C89") and IEEE
     Std 1003.2-1992 ("POSIX.2").

CAVEATS
     Never supply the system() function	with a command containing any part of
     an	unsanitized user-supplied string.  Shell meta-characters present will
     be	honored	by the sh(1) command interpreter.

BSD				August 2, 2007				   BSD

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | STANDARDS | CAVEATS

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