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Renaming Textpattern directory
If you’re looking to rename the Textpattern admin directory (which by default is “textpattern”), then you may do this with mod_rewrite through your .htaccess:
RewriteEngine On RewriteRule ^admin/(.*) /textpattern/$1 [NC,L]
where “admin” would be come the new directory name. (http://yoursite.com/textpattern will still work, however.)
Thanks to Andrew for this answer.