Re: List words separated by comma and without duplicates

[Curt <curty@free.fr>]

On 2018-04-29, <tomas@tuxteam.de> <tomas@tuxteam.de> wrote:
>
>> 
>> How can I do that with proper Unix commands?
>
> The "classical":
>
>   tomas@trotzki:/tmp$ cat foo
>   Arvo Part
>   Harold Pinter
>   Lucio Battisti
>   Antonio Amurri
>   Eduardo De Filippo
>   Eduardo De Filippo
>
> tomas@trotzki:/tmp$ sort -u < foo | sed -e 's/$/,/g' | tr '\n' ' '
> Antonio Amurri, Arvo Part, Eduardo De Filippo, Harold Pinter, Lucio Battisti, 
>
> Note that (a) the list ends with ", " (comma-space) and has no newline at
> the end, but I preferred to present a simple proto-solution easier for you
> to munge.
>
> The tr is there because sed goes line-wise and thus can't replace newlines.
> Except that it can; you pay for it, though [1], [2].
>

Not knowing anything I came up with (after some research):

sort -u < test.txt | tr '\n' ',' 

No sed. 

My list has a comma at the beginning as well as at the end, though (with
no newline, either).

But if we were going to the moon with this I would be economizing that
supernumerary process.

;-)

-- 
"Three prisoners were locked in a cell. When the largest of them finished his
food, he immediately ate the others. Too bad. An apostrophe in the right place
might have prevented a horrible crime." Joe Gunn