transfer a URL
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-s, --silent
Silent or quiet mode. Don't show progress meter or error messages. Makes Curl mute.
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-f, --fail
(HTTP) Fail silently (no output at all) on server errors. This is mostly done to better enable
scripts etc to better deal with failed attempts. In normal cases when a HTTP server fails to
deliver a document, it returns an HTML document stating so (which often also describes why and
more). This flag will prevent curl from outputting that and return error 22.
This method is not fail-safe and there are occasions where non-successful response codes will slip
through, especially when authentication is involved (response codes 401 and 407).
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-a, --append
(FTP/SFTP) When used in an upload, this will tell curl to append to the target file instead of
overwriting it. If the file doesn't exist, it will be created. Note that this flag is ignored by
some SSH servers (including OpenSSH).
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-t, --telnet-option <OPT=val>
Pass options to the telnet protocol. Supported options are:
TTYPE=<term> Sets the terminal type.
XDISPLOC=<X display> Sets the X display location.
NEW_ENV=<var,val> Sets an environment variable.
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