1.9 KiB
| c | SPDX-License-Identifier | Long | Arg | Help | Category | Added | Multi | See-also | Example | ||
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| Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. | curl | variable | <[%]name=text/@file> | Set variable | curl | 8.3.0 | append |
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--variable
Set a variable with "name=content" or "name@file" (where "file" can be stdin if set to a single dash (-)). The name is a case sensitive identifier that must consist of no other letters than a-z, A-Z, 0-9 or underscore. The specified content is then associated with this identifier.
Setting the same variable name again overwrites the old contents with the new.
The contents of a variable can be referenced in a later command line option when that option name is prefixed with "--expand-", and the name is used as "{{name}}" (without the quotes).
--variable can import environment variables into the name space. Opt to either require the environment variable to be set or provide a default value for the variable in case it is not already set.
--variable %name imports the variable called 'name' but exits with an error if that environment variable is not already set. To provide a default value if 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.
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 comma-separated list that is evaluated in a left-to-right order. Variable content holding null bytes that are not encoded when expanded, causes an error.
Available functions:
trim
removes all leading and trailing white space.
json
outputs the content using JSON string quoting rules.
url
shows the content URL (percent) encoded.
b64
expands the variable base64 encoded