[Libguestfs] [PATCH nbdkit 1/4] build: Move list of plugins and filters to the configure script.

[Eric Blake]

On 9/11/18 4:06 PM, Richard W.M. Jones wrote:

>>> +        "
>>> +plugins="$(echo $lang_plugins $non_lang_plugins | xargs -n1 | sort -u | xargs)"
>>
>> Your use of xargs as a reformatter is interesting ;) Could also be spelled:
>>
>> $(echo $lang_plugins $non_lang_plugins | tr -s ' \t\n' ' ' | sort -u
>> | tr ' ' '\n')"
>>
>> but that's longer to type, so your version is fine.
> 
> This one actually came from stackoverflow:
> 
>    https://stackoverflow.com/a/8802788

which also mentioned:

plugins=$(echo $(printf %s\\n $lang_plugins $non_lang_plugins | sort -u))

for less typing, fewer processes, and no dependence on xargs.

Isn't shell golf fun :)

> 
> I wanted something that would work on BSD (although I didn't test it
> yet ...)

I haven't tested on BSD either, but all of the solutions listed here 
[whether xargs, tr, or $echo $(printf %s\\n)] are portable at least 
according to POSIX.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
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