variable.md: mention --expand-variable for variables to variables

To assign a variable using contents from another variable.

Closes #15752
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Daniel Stenberg 2024-12-15 23:07:57 +01:00
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@ -36,6 +36,12 @@ the environment variable is not set, use --variable %name=content or
--variable %name@content. Note that on some systems - but not all -
environment variables are case insensitive.
To assign a variable using contents from another variable, use
--expand-variable. Like for example assigning a new variable using contents
from two other:
curl --expand-variable "user={{firstname}} {{lastname}}"
When expanding variables, curl supports a set of functions that can make the
variable contents more convenient to use. You apply a function to a variable
expansion by adding a colon and then list the desired functions in a