canlock-hfp -h | -v
canlock-hfp [-d] [-n]
Header Field Parser (hfp) for RFC 8315 conformant header fields.
The header field is read from stdin.
The input data must be an unfolded "Cancel-Lock" or "Cancel-Key" header field without line break at the end. The utility canlock-mhp(1) can be used to extract the field from an article.
If such a header field is found, it is parsed according to the syntax defined in RFC 8315. If valid c-lock or c-key (respectively) elements are found, they are printed to stdout with SP (Space) as delimiter.
Note: Additional formatting output is printed on stderr to make the output more human readable on a terminal. Redirect stderr to /dev/null if this is not wanted.