in reply to Re^2: quotes in Perl
in thread quotes in Perl
Here Documents
If you want to quote many lines of text literally, you use the "Here Document" notation which consists of an introductory line which has two open angles followed by a keyword, the end tag, for signalling the end of the quote. All text and lines following the introductory line are quoted. The quote ends when the end tag is found, by itself, on a line. For example, the end tag is "EOT":This example, when run, produces the following:<font size="-1">#!/usr/bin/perl -w use strict; my $foo = 123.45; my $bar = "Martha Stewedprune"; print <<"EOT"; ===== This is an example of text taken literally except that variables are expanded where their variable names appear. foo: $foo bar: $bar EOT
===== This is an example of text taken literally except that variables are expanded where their variable names appear. foo: 123.45 bar: Martha Stewedprune
They way you quote, the end tag is important: like their regular quote counterparts, double-quotes allow expansion of variables and special characters, single quotes don't allow expansion. You may also have a bare, unquoted, end tag; this is equivalent to a double quote, i.e., expansion expansion.
Some warnings:
- The end tag specifier must follow the << without any intermediate space.
- The actual end tag must be exactly the same as in the introduction line.
- Don't forget that the introduction line must end with a semicolon, just like any other perl statement.
Prints just what we would hope:my $url = "http://www.maperl.com"; my $text = "Mother of Perl"; print <<"EOT"; <a href="$url">$text</a> EOT
<a href="http://www.maperl.com">Mother of Perl</a>
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Re^4: quotes in Perl
by jZed (Prior) on Oct 21, 2004 at 02:35 UTC | |
by apotheon (Deacon) on Oct 21, 2004 at 06:20 UTC |
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