From: perl-win32-users-boun...@listserv.activestate.com
[mailto:perl-win32-users-boun...@listserv.activestate.com] On Behalf Of
Greg Aiken
Sent: 20 October 2010 18:10
To: perl-win32-users@listserv.activestate.com
Subject: lame question "\\\\.\\pipe\\pipename" vs '\\.\pipe\pipename'
> forgive my ignorance here, but I thought single quoted, or
apostrophized [however you call this character] (') text strings were
supposed to be
> interpreted by perl in an unaltered manner.
>
> sample code, indicating how to reference a named pipe in the
Win32::Pipe module, shows something like this...
>
> "\\\\.\\pipe\\pipename <file:///\\\pipe\pipename> " (note enclosed in
quotes)
>
> I thought the excessive quantities of backslashes seemed silly, so I
instead used single quotes and tried...
>
> '\\.\pipe\pipename' (note enclosed in apostrophies)
>
> only to find that my client pipe program did not work.
>
> I then did a simple test print program;
> print '\\.\pipe\pipename';
>
> and I was surprised to see what actually printed to the screen was
instead;
> \.\pipe\pipename (note the first \ is not shown in output!)
>
> this explained why my client pipe program was working...
>
> but it left me scratching my head to ask, "why is the backslash
character being interpreted as a special perl operator when it is found
within
> apostrophies?"
>
> I thought that only happened when the backslash is found within
quotes, such as (print "\x43"), which should print a capital C
>From 'perldoc perldata':
String literals are usually delimited by either single or double quotes.
They work much like quotes in the standard Unix shells: double-quoted
string literals are subject to backslash and variable substitution;
single-quoted strings are not (except for \' and \\).
Unless you are using the string as a command line argument, then /
should work, and not need escaping.
HTH
--
Brian Raven
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