/** ** make a system call **/ system(str) char *str; { int status; register int i; register int pid; pid = fork(); if (pid == -1) __error("system: fork error"); if (pid == 0) { execl("/bin/sh", "-sh", "-c", str, 0); __error("system: exec error"); } while ((i = wait(&status)) != -1) if (i == pid) break; return(status); }