The standard Unix semantics is this: a child process inherits the
environment from its parent. Therefore if you (export and) set an
environment variable in a process and then run a script, it will see
that environment variable.
Furthermore, _Programming Perl, 3rd ed_ by Wall et all says this about
%ENV on p. 661:
Setting a value in %ENV changes the environment for both your process
and child processes launched after the assignment.
I tried this test program and it worked:
$ENV{MCGILLICUDY} = 'corncob pipe';
system( qq{echo \$MCGILLICUDY} );
-Will
> -----Original Message-----
> From: Scott Smith [mailto:[EMAIL PROTECTED]
> Sent: Friday 19 January 2007 14:53
> To: Reidy, Ron
> Cc: Oscar Gomez; dbi-users@perl.org
> Subject: Re: environment variable
>
>
> Reidy, Ron wrote:
> > Oscar,
> >
> > Short answer - you cannot (sort of). This is because your
> shell script
> > will execute in a sub shell of your perl program.
> >
> > However, you can do something like this:
> >
> > # untested
> > system("export VAR=val; /path/to/your/shell/script.sh");
>
> The shell also takes a series of zero or more key-value pairs
> at the start of any command:
>
> system("VAR=val VAR2=anotherval /path/to/any/program");
>
> This has the same effect as exporting when you're doing it
> with Perl's system call, but it's good to
> keep in mind when you don't want to keep the variable setting
> or override in your general shell
> session. i.e.
>
> LD_PRELOAD=/usr/lib/special_old_library.so /usr/bin/oldprogram
>
> Scott Smith
> Genome Sequencing Center
>
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