4.4.1.8 Nroff Filter

The ‘nroff’ filter mode allows you to check the spelling of Nroff documents. The mode is enabled by giving ‘--add-filter=nroff’ or ‘-n’ command line option to aspell. It is also automatically enabled if the first three characters of the file being checked are .\" (a nroff comment marker) or the file name ends in a one of the following suffixes:

• single decimal digit from ‘0’ to ‘9’
• letter ‘n’
• ‘tmac’

This filter mode skips following nroff language elements:

• Comments
• Requests
• Names of nroff registers (both traditional two-letter names and GNU nroff long names)
• Arguments to the following requests: ds, de, nr, do, so.
• Arguments to font switch (\f) and size switch (\s) escapes
• Arguments to extended charset escape in both traditional (\() and extended (\[comp1 comp2 …]) form.