Sponsored Content
Full Discussion: What is $! ?
Top Forums UNIX for Dummies Questions & Answers What is $! ? Post 302368067 by guruparan18 on Wednesday 4th of November 2009 05:24:17 AM
Old 11-04-2009
MySQL What is $! ?

Hi All,

What is the meaning for $! in shell? I am trying to understand a script. And it has the following sequence of commands.

Code:
local@usr> a=1
local@usr> echo $a
1
local@usr> echo $!a
a

It is printing the variable back. Is it all for that? What are the other $x option you have? Few I know are $$, $*, $?. If anyone can point me to a good source, it will be helpful.
 
Graphics::Primitive::Insets(3pm)			User Contributed Perl Documentation			  Graphics::Primitive::Insets(3pm)

NAME
Graphics::Primitive::Insets - Space between things DESCRIPTION
Graphics::Primitive::Insets represents the amount of space that surrounds something. This object can be used to represent either padding or margins (in the CSS sense, one being inside the bounding box, the other being outside) SYNOPSIS
use Graphics::Primitive::Insets; my $insets = Graphics::Primitive::Insets->new({ top => 5, bottom => 5, left => 5, right => 5 }); METHODS
Constructor new Creates a new Graphics::Primitive::Insets. Instance Methods as_array Return these insets as an array in the form of top, right, bottom and left. bottom Set/Get the inset from the bottom. equal_to Determine if these Insets are equal to another. left Set/Get the inset from the left. right Set/Get the inset from the right. top Set/Get the inset from the top. zero Sets all the insets (top, left, bottom, right) to 0. AUTHOR
Cory Watson, "<gphat@cpan.org>" SEE ALSO
perl(1) COPYRIGHT &; LICENSE Copyright 2008-2010 by Cory G Watson. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.12.3 2010-08-21 Graphics::Primitive::Insets(3pm)
All times are GMT -4. The time now is 09:04 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy