rem: printf("usage: error number\n" "Displays the message text for OS error codes. "
add: printf("Usage: error number\n" "Prints the message text for OS error codes. "
context: main(int argc, char *argv[]){	if (argc != 2)		printf("usage: error number\n"		       "Displays the message text for OS error codes. "		       "The error number can be in decimal, hex or octal.\n");	else		print_error(argv[1]);		return 0;}