Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Can someone link me to a node or some URL that shows you all the $env variables we have to play with?

thanks everyone

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Re: list of all the $env variables
by biosysadmin (Deacon) on May 08, 2004 at 19:54 UTC
    As merlyn said, all of your environment variables are stored in the %ENV hash. To list them, just iterate over the members of a hash. Here's how I would do it: 
    print "List of all environment variables:\n";
while ( my($env_name,$env_value) = each %ENV ) {
    print "\t$env_name = $env_value\n";
}

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•Re: list of all the $env variables
by merlyn (Sage) on May 08, 2004 at 19:50 UTC
    There's only one $env variable, and it starts out undeclared.

    Perhaps you mean %ENV? In which case, a simple loop will dump them, or just go into the debugger and enter x \%ENV.

    -- Randal L. Schwartz, Perl hacker
    Be sure to read my standard disclaimer if this is a reply.

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Re: list of all the $env variables
by eXile (Priest) on May 08, 2004 at 20:06 UTC
    If your question is targeted to CGI-programming you might find the ubiquitous env.pl script useful: 
    #!/bin/perl
print "Content-type: text/html\n\n";
print "<HTML>\n";
print "<TITLE>Server-provided Environment variables</TITLE>";
print "<BODY>\n";
print "<TABLE>\n";
print "<TR><TD colspan=2 align=center>Environment Variables</TD></TR>\
+n";
foreach my $x (keys %ENV) {
  print "<TR><TD>$x</TD><TD>$ENV{$x}</TD></TR>\n";
}
print "</TABLE></BODY></HTML>\n";

    [download]
    Put it in your cgi-bin (if it's not already there, I think it comes default with apache). Be sure it is executable by the user the webserver runs as. Otherwise google for an active env.pl on somebody elses webserver.
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        Being really lazy (being a virtue, yada yada), I just cut-and-paste the first env.pl I found googling. I agree doing this text/plain is way better.
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Re: list of all the $env variables
by b10m (Vicar) on May 08, 2004 at 20:05 UTC
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