fig10_06.pl

PERL语言资料 可以用于PERL程序设计

#!usr/bin/perl
# Fig. 10.6: fig10_06.pl
# program to work with files

use strict;
use warnings;

print "Opening file for output:\n";
open OUTFILE, ">file.txt" or die "Can't find file.txt : $!";
print "Outputting to file.\n";
print OUTFILE "There was an old lady\n";
close OUTFILE or die "Can not close file.txt : $!";

print "It now reads:\n";
open INFILE, "file.txt" or die "Can not open file.txt : $!";
print while (<INFILE>);
close INFILE or die "Can not close file.txt : $!";

print "\nLet us append to the end of the file:\n";
open OUTFILE, ">>file.txt" or die "Can not open file.txt : $!";
print OUTFILE "who lived in a shoe.\n";
close OUTFILE or die "Can not close file.txt : $!";

print "It now reads:\n";
open INFILE, "file.txt" or die "Can not open file.txt : $!";
print while (<INFILE>);
close INFILE or die "Can not close file.txt : $!";

###########################################################################
#  (C) Copyright 2001 by Deitel & Associates, Inc. and Prentice Hall.     #
#  All Rights Reserved.                                                   #
#                                                                         #
#  DISCLAIMER: The authors and publisher of this book have used their     #
#  best efforts in preparing the book. These efforts include the          #
#  development, research, and testing of the theories and programs        #
#  to determine their effectiveness. The authors and publisher make       #
#  no warranty of any kind, expressed or implied, with regard to these    #
#  programs or to the documentation contained in these books. The authors #
#  and publisher shall not be liable in any event for incidental or       #
#  consequential damages in connection with, or arising out of, the       #
#  furnishing, performance, or use of these programs.                     #
###########################################################################