Command line arguments

/* echo.c........ Sam Bent........ 1/14/88 */ /* print the command line arguments */ #include <stdio.h> main(int argc, char **argv) { ....printf("There are %d arguments:\n", argc); ....while (argc-- > 0) ........printf("'%s' ", *argv++); ....printf("\n"); }

The shell passes two arguments to main when you run a program: argc --
....the number of words in the command line (including the name of the
....program), argv -- an array of strings containing the words.