Mcksum cksum.c /^main(argc, argv)$/ crc crc.c /^crc(fd, cval, clen)$/ csum1 sum1.c /^csum1(fd, cval, clen)$/ csum2 sum2.c /^csum2(fd, cval, clen)$/ pcrc print.c /^pcrc(fn, val, len)$/ psum1 print.c /^psum1(fn, val, len)$/ psum2 print.c /^psum2(fn, val, len)$/ usage cksum.c /^usage()$/