Variables

This concept of variables for the command line and config files was added in curl 8.3.0.

A user sets a variable to a plain string with --variable varName=content or from the contents of a file with --variable varName@file where the file can be stdin if set to a single dash (-).

A variable in this context is given a specific name and it holds contents. Any number of variables can be set. If you set the same variable name again, it gets overwritten with new content. Variable names are case sensitive, can be up to 128 characters long and may consist of the characters a-z, A-Z, 0-9 and underscore.

• Assign variables
• Expand variables
• Environment variables
• Expand --variable
• Expand functions