environment variables in perl

[Irfan Sayed]

hi,

i am executing one shell script within perl script. now what i need is , i need 
to make available all the variables set by that shell script to perl script
for example 

following is the shell script
build="abc"
export build
echo $build

now the value of $build i need to access in perl script 


if i do in perl like this :
print "Environment is : $ENV{'build'}\n";

then it does not pint anything 

can someone please suggest ??

regards
irf

environment variables in perl

[Irfan Sayed]

hi,
i am executing one shell script within perl script. now what i
 need is , i need to make available all the variables set by that shell 
script to perl script
for example 

following is the shell script
build="abc"
export build
echo $build

now the value of $build i need to access in perl script 

if i do in perl like this :
print "Environment is : $ENV{'build'}\n";
then it does not pint anything 
can someone please suggest ??

regards
irf

Re: environment variables in perl

[Shawn H Corey]

On 11-07-18 07:29 AM, Irfan Sayed wrote:

if i do in perl like this :
print "Environment is : $ENV{'build'}\n";

then it does not pint anything

can someone please suggest ??


In Windows, there is only one environment.  That means if a child 
process changes it, its parent can access the change.


In Linux, each process has its own environment.  The child process 
inherits its parent's at the time of the fork and each is independent 
thereafter.


If you want two processes to communicate, you need techniques called 
Inter-Process Communication (IPC).  See `perldoc perlipc` for details.



--
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Confusion is the first step of understanding.

Programming is as much about organization and communication
as it is about coding.

The secret to great software:  Fail early & often.

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Re: environment variables in perl

[Christian Walde]

On Mon, 18 Jul 2011 13:44:39 +0200, Shawn H Corey  wrote:


In Windows, there is only one environment.  That means if a child
process changes it, its parent can access the change.

In Linux, each process has its own environment.  The child process
inherits its parent's at the time of the fork and each is independent
thereafter.


That is most certainly not the case. On Windows %ENV behaves like it does on 
Linux:

https://gist.github.com/899a1385b703bba7f552

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Re: environment variables in perl

[Shawn H Corey]

On 11-07-18 09:24 AM, Christian Walde wrote:

On Mon, 18 Jul 2011 13:44:39 +0200, Shawn H Corey
 wrote:


In Windows, there is only one environment. That means if a child
process changes it, its parent can access the change.

In Linux, each process has its own environment. The child process
inherits its parent's at the time of the fork and each is independent
thereafter.


That is most certainly not the case. On Windows %ENV behaves like it
does on Linux:

https://gist.github.com/899a1385b703bba7f552



OK, that makes things easier.  Use `perldoc perlipc` for both.


--
Just my 0.0002 million dollars worth,
  Shawn

Confusion is the first step of understanding.

Programming is as much about organization and communication
as it is about coding.

The secret to great software:  Fail early & often.

Eliminate software piracy:  use only FLOSS.

--
To unsubscribe, e-mail: beginners-unsubscr...@perl.org
For additional commands, e-mail: beginners-h...@perl.org
http://learn.perl.org/

setting the environment variables in perl

[jason corbett]

How does one go about assuring that the environment variables are properly set in 
perl? I read several books, but none go in depth about how to write a script that 
includes all the required variables, that way nothing gets left out. 
 
Please advise.
 
JC
 
[snipet]
 
 
#!/usr/bin/perl -w

$ENV{"ORACLE_HOME"}="/orav101/oracle/8.1.7";

use strict; 
use DBI;
use lib '/home/samcsm/jason/myperl/lib/perl5/site_perl/';

 

Please Stop (Was: environment variables in perl)

[Shawn H Corey]

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so I won't get any more of these annoying messages?




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54E]

On 11-07-18 09:24 AM, Christian Walde wrote:

On Mon, 18 Jul 2011 13:44:39 +0200, Shawn H Corey
 wrote:


In Windows, there is only one environment. That means if a child
process changes it, its parent can access the change.

In Linux, each process has its own environment. The child process
inherits its parent's at the time of the fork and each is independent
thereafter.


That is most certainly not the case. On Windows %ENV behaves like it
does on Linux:

https://gist.github.com/899a1385b703bba7f552



OK, that makes things easier.  Use `perldoc perlipc` for both.


--
Just my 0.0002 million dollars worth,
   Shawn

Confusion is the first step of understanding.

Programming is as much about organization and communication
as it is about coding.

The secret to great software:  Fail early & often.

Eliminate software piracy:  use on

Re: setting the environment variables in perl

[Paul Kraus]

You can access all the env variables like this...

$ENV{ 'VAR' }

example
my $home = $ENV{ 'HOME' };
print "$home\n";

I have never tried to change them but I would assume
that it would work.

HTH,
Paul Kraus

On Tue, Jul 27, 2004 at 07:29:45AM -0700, jason corbett wrote:
> How does one go about assuring that the environment variables are properly set in 
> perl? I read several books, but none go in depth about how to write a script that 
> includes all the required variables, that way nothing gets left out. 
>  
> Please advise.
>  
> JC
>  
> [snipet]
>  
>  
> #!/usr/bin/perl -w
> 
> $ENV{"ORACLE_HOME"}="/orav101/oracle/8.1.7";
> 
> use strict; 
> use DBI;
> use lib '/home/samcsm/jason/myperl/lib/perl5/site_perl/';
> 
>  
> 


pgp1DvCvYBmPM.pgp
Description: PGP signature

Re: setting the environment variables in perl

[Flemming Greve Skovengaard]

Paul Kraus wrote:
You can access all the env variables like this...
$ENV{ 'VAR' }
example
my $home = $ENV{ 'HOME' };
print "$home\n";
I have never tried to change them but I would assume
that it would work.
HTH,
Paul Kraus
On Tue, Jul 27, 2004 at 07:29:45AM -0700, jason corbett wrote:
How does one go about assuring that the environment variables are properly set in perl? I read several books, but none go in depth about how to write a script that includes all the required variables, that way nothing gets left out. 

Please advise.
JC
[snipet]
#!/usr/bin/perl -w
$ENV{"ORACLE_HOME"}="/orav101/oracle/8.1.7";
use strict; 
use DBI;
use lib '/home/samcsm/jason/myperl/lib/perl5/site_perl/';



Use this one-liner to check your environment variables:
perl -Mstrict -we 'foreach my $key (sort keys %ENV) { print "$key => 
$ENV{$key}\n" }'

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RE: setting the environment variables in perl

[Bob Showalter]

jason corbett wrote:
> How does one go about assuring that the environment variables are
> properly set in perl? I read several books, but none go in depth
> about how to write a script that includes all the required variables,
> that way nothing gets left out.

It's really not a Perl issue per se. I assume you're talking about variables
used by Oracle libraries, like ORACLE_HOME and ORACLE_SID.

I advise you to *not* attempt to set or monkey with these variables inside
the Perl script. The whole point of environment variables is so the user can
establish his environment *before* invoking your script.

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RE: setting the environment variables in perl

[u235sentinel]

Good point in fact Oracle (for example) recommends setting the environment before you 
even install Oracle.  To do it any other way invites trouble and as Oracle would say, 
you're on your own :-)


> jason corbett wrote:
> > How does one go about assuring that the environment variables are
> > properly set in perl? I read several books, but none go in depth
> > about how to write a script that includes all the required variables,
> > that way nothing gets left out.
> 
> It's really not a Perl issue per se. I assume you're talking about variables
> used by Oracle libraries, like ORACLE_HOME and ORACLE_SID.
> 
> I advise you to *not* attempt to set or monkey with these variables inside
> the Perl script. The whole point of environment variables is so the user can
> establish his environment *before* invoking your script.
> 
> -- 
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, e-mail: [EMAIL PROTECTED]
>  
> 
> 

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RE: setting the environment variables in perl

[perl.org]

On Tue, 27 Jul 2004 11:58:51 -0400, Bob Showalter wrote
> 
> It's really not a Perl issue per se. I assume you're talking about variables
> used by Oracle libraries, like ORACLE_HOME and ORACLE_SID.
> 
> I advise you to *not* attempt to set or monkey with these variables inside
> the Perl script. The whole point of environment variables is so the 
> user can establish his environment *before* invoking your script.

I agree with this in general, but sometimes the environment in which your Perl
runs cannot define these variables for you.  For instance, Interwoven TeamSite
Data Capture Template inline callout invocations clear all environment
variables before forking your process (the vendor claims this is for security
reasons).  For Oracle you must set ORACLE_HOME, etc, and for SQL Server you
have to define SYSTEMROOT or something like that or ODBC or whatever doesn't
work.  If coded, this logic of course belongs in a module.  

I also sometimes use environment variables to hold global configurables when
it is not feasible to pass these values to the subroutines that need them. 
It's faster for the subroutine to use an environment variable than to do a
lookup into a flat file to get some configuration info.  If I put this in the
environment before forking the process the space would be cluttered.  If
there's a better way to cache global confgiurables or other feedback on these
subjects I am all ears - I don't like using the environment, let alone setting
values that should be set elsewhere.

Thanks,

   -John


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