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

     system -- pass a command to the shell

     Standard C Library (libc, -lc)

     #include <stdlib.h>

     system(const char *command);

     The system() function hands the argument command to the command interpreter sh(1).  The calling process
     waits for the shell to finish executing the command, ignoring SIGINT and SIGQUIT, and blocking SIGCHLD.

     If command is a NULL pointer, system() will return non-zero if the command interpreter sh(1) is avail-able, available,
     able, and zero if it is not.

     The system() function returns the exit status of the shell as returned by waitpid(2), or -1 if an error
     occurred when invoking fork(2) or waitpid(2).  A return value of 127 means the execution of the shell

     sh(1), execve(2), fork(2), waitpid(2), popen(3)

     The system() function conforms to ISO/IEC 9899:1990 (``ISO C90'') and is expected to be IEEE Std 1003.2
     (``POSIX.2'') compatible.

BSD                              June 4, 1993                              BSD

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