Networking

Linux curl command

Transfer data to or from a URL; -I requests response headers only.

Availability: Common Linux commands; shell built-ins and external implementations may differ by distribution.中文

Syntax

curl [OPTION]... URL...

Examples

Inspect response headers without downloading the body.

curl -I https://example.com

Save a successful response to a file and report errors.

curl -fsS https://example.com/data.json -o data.json

Parameters, options and clauses

Option / clause	Description
`-I, --head`	Fetch response headers only.
`-L, --location`	Follow HTTP redirects.
`-o FILE, --output FILE`	Write response data to FILE.
`-O, --remote-name`	Save using the remote filename.
`-H, --header HEADER`	Add a request header.
`-d, --data DATA`	Send request data (often used for POST).
`-f, --fail`	Return an error for HTTP error responses without outputting the error page.
`-sS, --silent --show-error`	Hide progress while still showing errors.

Safety note

Review a command and its target before running it. Commands that alter files, services, accounts, disks, permissions or databases may be difficult to reverse. Test in a safe environment and keep backups.

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