what is $@ Post: 302235545

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Top Forums UNIX for Dummies Questions & Answers what is $@ Post 302235545 by era on Friday 12th of September 2008 06:18:13 AM

09-12-2008

Registered User

It expands to the command-line parameters passed to the script. However, it's wrong; it should be in double quotes, like "$@"

Code:

vnix$ cat >script
echo args: "$@"
for f in "$@"; do echo "arg: $f"; done
^D
vnix$ sh ./script foo bar baz
args: foo bar baz
arg: foo
arg: bar
arg: baz

Last edited by era; 09-12-2008 at 07:20 AM.. Reason: Add sample script

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mojo::json::pointer

Mojo::JSON::Pointer(3pm)				User Contributed Perl Documentation				  Mojo::JSON::Pointer(3pm)

NAME

       Mojo::JSON::Pointer - JSON Pointers

SYNOPSIS

	 use Mojo::JSON::Pointer;

	 my $p = Mojo::JSON::Pointer->new;
	 say $p->get({foo => [23, 'bar']}, '/foo/1');
	 say 'Contains "/foo".' if $p->contains({foo => [23, 'bar']}, '/foo');

DESCRIPTION

       Mojo::JSON::Pointer implements JSON Pointers as described in http://tools.ietf.org/html/draft-ietf-appsawg-json-pointer
       <http://tools.ietf.org/html/draft-ietf-appsawg-json-pointer>.

METHODS

   "contains"
	 my $success = $p->contains($data, '/foo/1');

       Check if data structure contains a value that can be identified with the given JSON Pointer.

	 # True
	 $p->contains({foo => 'bar', baz => [4, 5, 6]}, '/foo');
	 $p->contains({foo => 'bar', baz => [4, 5, 6]}, '/baz/2');

	 # False
	 $p->contains({foo => 'bar', baz => [4, 5, 6]}, '/bar');
	 $p->contains({foo => 'bar', baz => [4, 5, 6]}, '/baz/9');

   "get"
	 my $value = $p->get($data, '/foo/bar');

       Extract value identified by the given JSON Pointer.

	 # "bar"
	 $p->get({foo => 'bar', baz => [4, 5, 6]}, '/foo');

	 # "4"
	 $p->get({foo => 'bar', baz => [4, 5, 6]}, '/baz/0');

	 # "6"
	 $p->get({foo => 'bar', baz => [4, 5, 6]}, '/baz/2');

SEE ALSO

       Mojolicious, Mojolicious::Guides, <http://mojolicio.us>.

perl v5.14.2							    2012-09-05						  Mojo::JSON::Pointer(3pm)