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