Re: Specify multiple "@" files for --data

On Thu, 16 Jan 2020, Norton, Mike via curl-users wrote:

> This is regarding "--data" (-d) - according to manpage:
>
>> If you start the data with the letter @, the rest should be a file name
>> to read the data from, or - if you want curl to read the data from
>> stdin. Multiple files can also be specified.
>
> Unfortunately, I cannot find the part of the manpage that tells HOW to
> specify multiple files. I've tried commas, semicolons, quoted space,
> multiple @ characters... everything I could think of results in Curl
> treating whatever I specify as if it was all a single filename. Anyone?

The wording there is slightly misleading. You don't specify multiple files
with *one* --data flag, you use multiple. (Although I wouldn't mind supporting
exactly what you're asking for, somehow.)

> I am aware of the possibility to use "--data" more than once, but that
> separates the data with the "&" character, which is not the behaviour I
> want.

There are two ways to accomplish that. One is using a temp file, one using
stdin:

  $ cat file1 file2 > uploadfile
  $ curl -d @uploadfile $URL
  $ rm uploadfile

and

  $ cat file1 file2 | curl -d_at_- $URL

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