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authorJarkko Hietaniemi <jhi@iki.fi>2002-04-08 18:56:58 +0000
committerJarkko Hietaniemi <jhi@iki.fi>2002-04-08 18:56:58 +0000
commitf05bbc4047b4e519eb0edbaf2fce2004f4838d1a (patch)
treede226ce5a9d015aefd62d1b704bb24f8d232801f /pod/perlfaq5.pod
parentfdd579e2dc5d0da16b7e86246a01f0d838120df7 (diff)
downloadperl-f05bbc4047b4e519eb0edbaf2fce2004f4838d1a.tar.gz
FAQ sync. (Ignoring the few URL differences for now.)
p4raw-id: //depot/perl@15813
Diffstat (limited to 'pod/perlfaq5.pod')
-rw-r--r--pod/perlfaq5.pod25
1 files changed, 9 insertions, 16 deletions
diff --git a/pod/perlfaq5.pod b/pod/perlfaq5.pod
index 701a757558..4030824bf2 100644
--- a/pod/perlfaq5.pod
+++ b/pod/perlfaq5.pod
@@ -1,6 +1,6 @@
=head1 NAME
-perlfaq5 - Files and Formats ($Revision: 1.12 $, $Date: 2002/03/11 22:25:25 $)
+perlfaq5 - Files and Formats ($Revision: 1.14 $, $Date: 2002/04/07 18:33:45 $)
=head1 DESCRIPTION
@@ -763,21 +763,7 @@ more fun to use the standard DB_File module's $DB_RECNO bindings,
which allow you to tie an array to a file so that accessing an element
the array actually accesses the corresponding line in the file.
-On very rare occasion, you may have an algorithm that demands that
-the entire file be in memory at once as one scalar. The simplest solution
-to that is
-
- $var = `cat $file`;
-
-Being in scalar context, you get the whole thing. In list context,
-you'd get a list of all the lines:
-
- @lines = `cat $file`;
-
-This tiny but expedient solution is neat, clean, and portable to
-all systems on which decent tools have been installed. For those
-who prefer not to use the toolbox, you can of course read the file
-manually, although this makes for more complicated code.
+You can read the entire filehandle contents into a scalar.
{
local(*INPUT, $/);
@@ -790,6 +776,13 @@ close the file at block exit. If the file is already open, just use this:
$var = do { local $/; <INPUT> };
+For ordinary files you can also use the read function.
+
+ read( INPUT, $var, -s INPUT );
+
+The third argument tests the byte size of the data on the INPUT filehandle
+and reads that many bytes into the buffer $var.
+
=head2 How can I read in a file by paragraphs?
Use the C<$/> variable (see L<perlvar> for details). You can either