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Full Discussion: ! operator in variable
Top Forums Shell Programming and Scripting ! operator in variable Post 302200770 by jaduks on Friday 30th of May 2008 03:29:10 AM
Old 05-30-2008
Its basically content of content of a variable.

See similar post: https://www.unix.com/shell-programmin...-variable.html

Code:
x=t
t=20

y=${!x}
echo $y

Try the above, you will come to know

//Jadu
 

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LEARN ABOUT DEBIAN

arch::liteweb

Arch::LiteWeb(3pm)					User Contributed Perl Documentation					Arch::LiteWeb(3pm)

NAME

       Arch::LiteWeb - simple way to access web pages

SYNOPSIS

	   my $web = Arch::LiteWeb->new;
	   my $content = $web->get("http://some.domain:81/some/path");
	   die $web->error . " while processing " . $web->request_url
	       unless $content;
	   my $content_type = $web->response_headers->{content_type};

DESCRIPTION

       This class provides a basic and easy to use support for the client-side HTTP.  It is supplied in order to avoid dependency on LWP. If such
       dependency is not a problem, consider to use LWP instead that provides much better support for HTTP and other protocols.

METHODS

       The following class methods are available:

       get, post, request_url, error, error_with_url, network_error, response_code, response_codestr, response_error, response_headers,
       response_content.

       get url [params ...]
	   Execute HTTP get of the given url and return the html string or undef on network/response error. Use other methods to get the details
	   about the error and the response.

	   params is key-value hash, the following keys are supported:

	       url_host 	   - only used if url is none
	       url_port 	   - only used if url is none(80)
	       url_path 	   - only used if url is none
	       endl		   - default is "1512"
	       timeout		   - default is 20 seconds
	       user_agent	   - default is "Arch::LiteWeb/0.1"
	       nocache		   - add a no-cache header
	       noredirect	   - don't follow redirect responses
	       max_redirect_depth  - default is 5
	       use_proxy	   - default is false
	       proxy_url	   - proxy url ($http_proxy supported too)
	       proxy_host	   - only used if proxy_url is none
	       proxy_port	   - only used if proxy_url is none(80)

       post url input [params]
	   Not implemented yet.

       request_url
	   Actual url of the last issued request or undef. If partial redirect responses are enabled, then the result is the last (non-redirect)
	   url.

       error
	   If the last request resulted in error (i.e. get/post returned undef), then this method returns the error message, otherwise it returns
	   undef.  This is just a shortcut for network_error || response_error.

       error_with_url
	   Like error, but with "
while fetching request_url
" text appended if non undef.

       network_error
	   The network error message for the last request or undef.

       response_error
	   The response error message for the last request or undef.

       response_code
	   The last response code (integer) or undef.

       response_codestr
	   The last response code (string) or undef.

       response_headers
	   The last response headers (hashref of HTTP headers) or undef.

       response_content
	   The last response content or undef.	This is the same thing that the last get/post returns.

BUGS

       Not intended for use in mission-critical applications.

AUTHORS

       Mikhael Goikhman (migo@homemail.com--Perl-GPL/arch-perl--devel).

SEE ALSO

       For more information, see LWP, LWP::Simple.

perl v5.10.1							    2005-03-25							Arch::LiteWeb(3pm)
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