Re: Passing shell variables to PERL

2004-10-08 Thread Jeff Westman 
On Wed, 06 Oct 2004 16:21:31 -0700, John W. Krahn [EMAIL PROTECTED] wrote:
 [Please do not top-post.  TIA]

ok

 Jeff Westman wrote:
 
  On Tue, 05 Oct 2004 15:30:59 -0700, John W. Krahn wrote:
 
 Jim wrote:
 
 Willy Perez wrote:
 
 Is there a method to pass a shell assigned variable to perl?
 
 For ex:
 
 ABC=xyc
 
 perl -ne 'print $ABC'
 
 In awk you could use ENVIRON[varname], is there something
 compatible in perl.
 
 You can do the same in perl with the  special hash named %ENV.
 for instance: print $ENV{'SHELL'}
 
 or you can use the env module:
 perldoc -f env
 
 perl is case sensitive so that should be Env not env.
  
  You have to export the variable if you want perl to recognize it!
 
  Example:
 
  $ ABC=xyz
  $ perl -e  'print $ENV{ABC}\n'
 
  $ export ABC=xyz
  $ perl -e  'print $ENV{ABC}\n'
  xyz
  $
 
 How is that related to using the Env module?

Everything.  The original poster asked how to display some varaibles
from the shell.  You CANNOT display those in perl unless you export
them in the shell first.

Have you tested it?  I did.  If you don't export it (as I showed in my
example above), nothing is listed.  Once exported, the perl command
line is then aware of the environement.  The point is, unless
exported, the ENV module is useless since it is unaware of the parent
environment.

Disclaimer:  this is for *nix systems; in DOS/Win systems, variables
are always exported.

 John
 --
 use Perl;
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 fulfillment

-Jeff

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Re: Passing shell variables to PERL

2004-10-06 Thread Jeff Westman 
You have to export the variable if you want perl to recognize it!

Example:

$ ABC=xyz   
$ perl -e  'print $ENV{ABC}\n'

$ export ABC=xyz
$ perl -e  'print $ENV{ABC}\n'
xyz
$


-Jeff


On Tue, 05 Oct 2004 15:30:59 -0700, John W. Krahn [EMAIL PROTECTED] wrote:
 Jim wrote:
 
  Willy Perez wrote:
 
 Is there a method to pass a shell assigned variable to perl?
 
 For ex:
 
 ABC=xyc
 
 perl -ne 'print $ABC'
 
 In awk you could use ENVIRON[varname], is there something
 compatible in perl.
  
  You can do the same in perl with the  special hash named %ENV.
  for instance: print $ENV{'SHELL'}
 
  or you can use the env module:
  perldoc -f env
 
 perl is case sensitive so that should be Env not env.
 
 John
 --
 use Perl;
 program
 fulfillment
 
 
 
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Re: Passing shell variables to PERL

2004-10-06 Thread John W. Krahn 
[Please do not top-post.  TIA]
Jeff Westman wrote:
On Tue, 05 Oct 2004 15:30:59 -0700, John W. Krahn wrote:
Jim wrote:
Willy Perez wrote:
Is there a method to pass a shell assigned variable to perl?
For ex:
ABC=xyc
perl -ne 'print $ABC'
In awk you could use ENVIRON[varname], is there something
compatible in perl.
You can do the same in perl with the  special hash named %ENV.
for instance: print $ENV{'SHELL'}
or you can use the env module:
perldoc -f env
perl is case sensitive so that should be Env not env.

 You have to export the variable if you want perl to recognize it!

 Example:

 $ ABC=xyz
 $ perl -e  'print $ENV{ABC}\n'

 $ export ABC=xyz
 $ perl -e  'print $ENV{ABC}\n'
 xyz
 $
How is that related to using the Env module?
John
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Passing shell variables to PERL

2004-10-05 Thread Willy Perez 

Hi,

Is there a method to pass a shell assigned variable to perl?

For ex:

ABC=xyc

perl -ne 'print $ABC'

In awk you could use ENVIRON[varname], is there something
compatible in perl.


Willy Perez
Liz Claiborne IT
(201) 295-7011

Re: Passing shell variables to PERL

2004-10-05 Thread David Greenberg 
$ENV{ABC}

This works for me, but I don't have a good understanding of what is
going on to make it work.

HTH,
David

On Tue, 5 Oct 2004 14:32:27 -0400, Willy Perez [EMAIL PROTECTED] wrote:
 
 Hi,
 
 Is there a method to pass a shell assigned variable to perl?
 
 For ex:
 
 ABC=xyc
 
 perl -ne 'print $ABC'
 
 In awk you could use ENVIRON[varname], is there something
 compatible in perl.
 
 
 Willy Perez
 Liz Claiborne IT
 (201) 295-7011
 


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RE: Passing shell variables to PERL

2004-10-05 Thread Jim 
  
 Hi,
 
 Is there a method to pass a shell assigned variable to perl?
 
 For ex:
 
 ABC=xyc
 
 perl -ne 'print $ABC'
 
 In awk you could use ENVIRON[varname], is there something 
 compatible in perl.
 

You can do the same in perl with the  special hash named %ENV.
for instance: print $ENV{'SHELL'}

or you can use the env module:
perldoc -f env


THanks
Jim

 

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Re: Passing shell variables to PERL

2004-10-05 Thread Errin Larsen 
On Tue, 5 Oct 2004 14:32:27 -0400, Willy Perez [EMAIL PROTECTED] wrote:
 
 Hi,
 
 Is there a method to pass a shell assigned variable to perl?
 
 For ex:
 
 ABC=xyc
 
 perl -ne 'print $ABC'
 
 In awk you could use ENVIRON[varname], is there something
 compatible in perl.
 
 
 Willy Perez
 Liz Claiborne IT
 (201) 295-7011
 

Hi Willy,

Perl will auto-magically take all of your shell environment variables
and put them in a hash:
  %ENV
where the keys are the variable names and the values are the values!

so, for your example above,
  # perl -e 'print $ENV{ABC}\n'
should work!

--Errin

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Re: Passing shell variables to PERL

2004-10-05 Thread Willy Perez 

Thanks Errin/Jim/David,

Hi Willy,

Perl will auto-magically take all of your shell environment variables and
put them in a hash:
  %ENV
where the keys are the variable names and the values are the values!

so, for your example above,
  # perl -e 'print $ENV{ABC}\n'
should work!

--Errin

You can do the same in perl with the  special hash named %ENV.
for instance: print $ENV{'SHELL'}

or you can use the env module:
perldoc -f env


THanks
Jim

$ENV{ABC}

This works for me, but I don't have a good understanding of what is going on
to make it work.

HTH,
David




Willy Perez
Liz Claiborne IT
(201) 295-7011

Re: Passing shell variables to PERL

2004-10-05 Thread John W. Krahn 
Jim wrote:
Willy Perez wrote:
Is there a method to pass a shell assigned variable to perl?
For ex:
ABC=xyc
perl -ne 'print $ABC'
In awk you could use ENVIRON[varname], is there something 
compatible in perl.
You can do the same in perl with the  special hash named %ENV.
for instance: print $ENV{'SHELL'}
or you can use the env module:
perldoc -f env
perl is case sensitive so that should be Env not env.
John
--
use Perl;
program
fulfillment
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