Its documented in perlrun under -i[extension]. Here is an example (based on this) 

#!/usr/bin/perl --

use strict;
use warnings;

use open qw' :std :encoding(UTF-8)';

Main( @ARGV );
exit( 0 );

sub Main
{
    local ( *ARGV,  $^I );
    @ARGV = @_;
    $^I = '.orig';
    while(<>){
#~ U+2018 (8216), U+2019 (8217)     &lsquo; &rsquo;     Single quotes 
+(left and right)
#~ U+201C (8220), U+201D (8221)     &ldquo; &rdquo;     Double quotes 
+(left and right)
#~ U+201B (HTML: &#8219;) – single high-reversed-9, or single reversed
+ comma, quotation mark (This is sometimes used to show dropped charac
+ters at the end of words, such as goin?  instead of using goin‘, goin
+’, goin`, or goin'[citation needed])
#~ U+201F (HTML: &#8223;) – double high-reversed-9, or double reversed
+ comma, quotation mark 
    
        y/\x{2018}\x{2019}\x{201B}\x{201C}\x{201D}\x{201F}/'''"""/;
        print;
    }
}
__END__

[download]

In reply to Re: Executing "perl -pi -e" in perl script by Anonymous Monk
in thread Executing "perl -pi -e" in perl script by nbokare

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.