# phpman > perldoc > ps

## Found in /usr/share/perl/5.34/pod/perlfaq1.pod
  Who supports Perl? Who develops it? Why is it free?
    The original culture of the pre-populist Internet and the deeply-held
    beliefs of Perl's author, Larry Wall, gave rise to the free and open
    distribution policy of Perl. Perl is supported by its users. The core,
    the standard Perl library, the optional modules, and the documentation
    you're reading now were all written by volunteers.

    The core development team (known as the Perl Porters) are a group of
    highly altruistic individuals committed to producing better software for
    free than you could hope to purchase for money. You may snoop on pending
    developments via the archives
    <<http://www.nntp.perl.org/group/perl.perl5.porters/>> or you can
    subscribe to the mailing list by sending
    <perl5-porters-subscribe@perl.org> a subscription request (an empty
    message with no subject is fine).

    While the GNU project includes Perl in its distributions, there's no
    such thing as "GNU Perl". Perl is not produced nor maintained by the
    Free Software Foundation. Perl's licensing terms are also more open than
    GNU software's tend to be.

    You can get commercial support of Perl if you wish, although for most
    users the informal support will more than suffice. See the answer to
    "Where can I buy a commercial version of Perl?" for more information.

## Found in /usr/share/perl/5.34/pod/perlfaq8.pod
  Is there a way to hide perl's command line from programs such as "ps"?
    First of all note that if you're doing this for security reasons (to
    avoid people seeing passwords, for example) then you should rewrite your
    program so that critical information is never given as an argument.
    Hiding the arguments won't make your program completely secure.

    To actually alter the visible command line, you can assign to the
    variable $0 as documented in perlvar. This won't work on all operating
    systems, though. Daemon programs like sendmail place their state there,
    as in:

        $0 = "orcus [accepting connections]";

## Found in /usr/share/perl/5.34/pod/perlfaq9.pod
  What is Plack and PSGI?
    PSGI is the Perl Web Server Gateway Interface Specification, it is a
    standard that many Perl web frameworks use, you should not need to
    understand it to build a web site, the part you might want to use is
    Plack.

    Plack is a set of tools for using the PSGI stack. It contains middleware
    <<https://metacpan.org/search?q=plack%3A%3Amiddleware>> components, a
    reference server and utilities for Web application frameworks. Plack is
    like Ruby's Rack or Python's Paste for WSGI.

    You could build a web site using Plack and your own code, but for
    anything other than a very basic web site, using a web framework (that
    uses <<https://plackperl.org>>) is a better option.