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Task/File-input-output/Perl/file-input-output.pl

@@ -0,0 +1,18 @@
+#!/usr/bin/perl
+
+open my $fh_in, '<', 'input.txt' or die "could not open <input.txt> for reading: $!";
+open my $fh_out, '>', 'output.txt' or die "could not open <output.txt> for writing: $!";
+# '>' overwrites file, '>>' appends to file, just like in the shell
+
+binmode $fh_out; # marks filehandle for binary content on systems where that matters
+
+print $fh_out $_ while <$fh_in>;
+# prints current line to file associated with $fh_out filehandle
+
+# the same, less concise
+#while (<$fh_in>) {
+#  print $fh_out $_;
+#};
+
+close $fh_in;
+close $fh_out;