|-
| '''Summary'''
|Creates the directory specified by {{Code|$dir}}, including all nonif it does not already exist. Non-existing parent directorieswill be created as well.<br />
|-
| '''Errors'''
|{{Error|exists|#Errors}} a file with the same path already specified target exists, but is no directory.<br />{{Error|io-error|#Errors}} the operation fails for some other reason.<br />
|}