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Apparently that port is used for the "plan 9 file service", so it's probably some kind of ftp-like client for 9p.

probably cl[ient] then

Thanks

At a guess an alias for 'lc' (list contents).

I think `ls` is list as in unix and `lc` is list columns, just like `ls|mc` `list` | `multicolumn`.

There is no manual page for `cl`, so thats probably a typo.