comment on

That command is wrong. You want

perl -CSD -Mutf8 -pe"s/’/'/g;"
[download]

-Cio has no effect in that example, which you can see by removing it.

$ echo It’s easy | perl -pe"s/’/'/g;"
It's easy
[download]

-Ci only has an effect if reading from a file

$ perl -Cio -pe"s/’/'/g;" <( echo "It’s easy" )
Wide character in print at -e line 1, <> line 1.
It’s easy
[download]

This is what you want if reading from a file:

$ perl -CiO -Mutf8 -pe"s/’/'/g;" <( echo "It’s easy" )
It's easy
[download]

This is what you want if reading from STDIN:

$ echo "It’s easy" | perl -CIO -Mutf8 -pe"s/’/'/g;"
It's easy
[download]

Combining both, you can use

perl -CiIO -Mutf8 -pe"s/’/'/g;"
[download]

Better:

perl -CSD -Mutf8 -pe"s/’/'/g;"
[download]

Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
Want more info? How to link or How to display code and escape characters are good places to start.