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cmdline/variables.md: the syntax is tweaked #530

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20 changes: 14 additions & 6 deletions cmdline/variables.md
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Expand Up @@ -35,13 +35,21 @@ You can assign the contents of a plain text file to a variable, too:

curl --variable varName@filename

Starting in curl 8.12.0, you can get a byte range from a given file by
appending `;[N-M]` to the file name, where `N` and `M` are numerical byte
offsets into the file where the second number can be omitted to mean until end
of file. For example, get the contents from a file from byte offset 100 to and
including byte offset 200:
Starting in curl 8.12.0, you can get a byte range from content by appending
`[N-M]` to the variable name, where `N` and `M` are numerical byte offsets
into the content where the second number can be omitted to mean until end of
data. For example, get the contents from a file from byte offset 100 to 199,
inclusive:

curl --variable "varName@filename;[100-200]"
curl --variable "varName[100-199]@filename"

Alternatively, get offset three to twelve from a plain text:

curl --variable "varName[3-12]=thefulltexttogetrangefrom"

Given a byte range that has no data results in an empty string. Asking for a
range that is larger than the content makes curl use the piece of the data
that exists.

## Expand

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