preconv --version (return code: 0)
GNU preconv (groff) version 1.22.3 with iconv support
preconv --help (return code: 0)
usage: preconv [ option ] [ files ]
-d show debugging messages
-D encoding specify default encoding
-e encoding specify input encoding
-h print this message
-r don't add .lf requests
-v print version number
The default encoding is `UTF-8'.