\* program to read command line input and open files specified */ include <stdio.h main(argc, argv) int argc; char **argv; { int c; FILE *from, *to; /* * Check our arguments. */ if (argc != 3) { fprintf(stderr, "Usage: %s from-file to-file\n, *argv); exit(1); } /* * Open the from-file for reading. */ if ((from = fopen(argv[1], "r)) == NULL) { perror(argv[1]); exit(1); } /* * Open the to-file for appending. If to-file does * not exist, fopen will create it. */ if ((to = fopen(argv[2], "a)) == NULL) { perror(argv[2]); exit(1); } /* * Now read characters from from-file until we * hit end-of-file, and put them onto to-file. */ while ((c = getc(from)) != EOF) putc(c, to); /* * Now close the files. */ fclose(from); fclose(to); exit(0); }
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