I'm a little worried about the absence of this variable when I execute the show variables command. This is what I get when I execute show variables like 'char%':

character_set_client        utf8
character_set_connection    utf8
character_set_database      utf8
character_set_results       utf8
character_set_server        utf8
character_set_system        utf8
character_sets_dir          /usr/share/mysql/charsets/

I wonder why this is happening. What does it mean? can I just add it to the my.cnf file?

Thank you...

Edit: Sorry, I recently noted that I didn't specify which variable we're talking about (though I said it in the title). The variable is character_set_filesystem. Thanks.