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Top Forums Shell Programming and Scripting strange behaviour from sed??? Post 302243320 by cfajohnson on Saturday 4th of October 2008 06:19:04 PM
Old 10-04-2008
Quote:
Originally Posted by alirezan
Hi all,
Hi all,

I want to do a very simple thing with sed. I want to print out the line number of a disk I have defined in /etc/exports, so I do:

Code:
# sed -n '/md0/=' /etc/exports
3

It's all good, but here's the problem. When I define md0 in a variable, I get nothing from sed:

Code:
# dev="md0"
# echo $dev
md0
# sed -n '/$dev/=' /etc/exports
#

Why is that? can anybody please help?

Variables are not expanded inside single quotes; use double quotes:

Code:
sed -n "/$dev/=" /etc/exports

 

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UNIVERSAL::exports(3pm) 				User Contributed Perl Documentation				   UNIVERSAL::exports(3pm)

NAME
UNIVERSAL::exports - Lightweight, universal exporting of variables SYNOPSIS
package Foo; use UNIVERSAL::exports; # Just like Exporter. @EXPORT = qw($This &That); @EXPORT_OK = qw(@Left %Right); # Meanwhile, in another piece of code! package Bar; use Foo; # exports $This and &That. DESCRIPTION
This is an alternative to Exporter intended to provide a universal, lightweight subset of its functionality. It uses Exporter::Lite, so look there for details. Additionally, "exports()" is provided to find out what symbols a module exports. UNIVERSAL::exports places its methods in the UNIVERSAL namespace, so there is no need to subclass from it. Methods UNIVERSAL::exports has two public methods, import() derived from Exporter::Lite, and exports(). import Some::Module->import; Some::Module->import(@symbols); This is Exporter::Lite's import() method. Look in Exporter::Lite for details. exports @exported_symbols = Some::Module->exports; Some::Module->exports($symbol); Reports what symbols are exported by Some::Module. With no arguments, it simply returns a list of all exportable symbols. Otherwise, it reports if it will export a given $symbol. DIAGNOSTICS
'"%s" is not exported by the %s module' Attempted to import a symbol which is not in @EXPORT or @EXPORT_OK. 'Can't export symbol: %s' Attempted to import a symbol of an unknown type (ie. the leading $@% salad wasn't recognized). AUTHORS
Michael G Schwern <schwern@pobox.com> BUGS and ISSUES Please report bugs and issues via <http://rt.cpan.org> LICENSE and COPYRIGHT Copyright 2001, 2006 Michael G Schwern This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See <http://www.perl.com/perl/misc/Artistic.html> SEE ALSO
Other ways to Export: Exporter, Exporter::Lite, Sub::Exporter, Exporter::Simple The Perl 6 RFC that started it all: <http://dev.perl.org/rfc/257.pod> More UNIVERSAL magic: UNIVERSAL::require perl v5.10.1 2006-09-03 UNIVERSAL::exports(3pm)
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