-a<format> Convert from the specified format. Formats may be specified by means of the following
arbitrary single character codes, by means of names such as "SGML_decimal", and by examples of the
desired format.
A Convert hexadecimal numbers with prefix U in angle-brackets (<U00E9>).
B Convert \x-escaped hex (e.g. \x00E9)
C Convert \x escaped hexadecimal numbers in braces (e.g. \x{00E9}).
D Convert decimal HTML numeric character references (e.g. é)
E Convert hexadecimal with prefix U (U00E9).
F Convert hexadecimal with prefix u (u00E9).
G Convert hexadecimal in single quotes with prefix X (e.g. X'00E9').
H Convert hexadecimal HTML numeric character references (e.g. é)
I Convert hexadecimal UTF-8 with each byte's hex preceded by an =-sign (e.g. =C3=A9) . This is the
Quoted Printable format defined by RFC 2045.
J Convert hexadecimal UTF-8 with each byte's hex preceded by a %-sign (e.g. %C3%A9). This is the
URIescape format defined by RFC 2396.
K Convert octal UTF-8 with each byte escaped by a backslash (e.g. \303\251)
L Convert \U followed by eight hex digits or \u followed by four hex digits. \UXXXXXXXX encoding a
character within the BMP (U+0000-U+FFFF) is converted but a warning is issued since this violates
the WWW specification.
M Convert hexadecimal SGML numeric character references (e.g. \#xE9;)
N Convert decimal SGML numeric character references (e.g. \#233;)
O Convert octal escapes for the three low bytes in big-endian order(e.g. \000\000\351))
P Convert hexadecimal numbers with prefix U+ (e.g. U+00E9)
Q Convert HTML character entities (e.g. é).
R Convert raw hexadecimal numbers (e.g. 00E9). Requires the -p flag.
S Convert hexadecimal escapes for the three low bytes in big-endian order (e.g. \x00\x00\xE9)
T Convert decimal escapes for the three low bytes in big-endian order (e.g. \d000\d000\d233)
U Convert \u-escaped hexadecimal numbers (e.g. \u00E9).
V Convert \u-escaped decimal numbers (e.g. \u00233).
X Convert standard hexadecimal numbers (e.g. 0x00E9).
Y Convert all three types of HTML escape: hexadecimal and decimal character references and
character entities.
0 Convert hexadecimal UTF-8 with each byte's hex enclosed within angle brackets (e.g. <C3><A9>).
1 Convert Common Lisp format hexadecimal numbers (e.g. #x00E9).
2 Convert Perl format decimal numbers with prefix v (e.g. v233).
3 Convert hexadecimal numbers with prefix $ (e.g. $00E9).
4 Convert Postscript format hexadecimal numbers with prefix 16# (e.g. 16#00E9).
5 Convert Common Lisp format hexadecimal numbers with prefix #16r (e.g. #16r00E9).
6 Convert ADA format hexadecimal numbers with prefix 16# and suffix # (e.g. 16#00E9#).
7 Convert Apache log format hexadecimal UTF-8 with each byte's hex preceded by a backslash-x (e.g.
\xC3\xA9).
8 Convert Microsoft OOXML format hexadecimal numbers with prefix _x and suffix _ (e.g. _x00E9_).
9 Convert %\u-escaped hexadecimal numbers (e.g. %\u00E9).
-h Help. Print the usage message and exit.
-v Print program version information and exit.
-m Accept deprecated HTML entities lacking final semicolon, e.g. "é" in place of "é".
-p Pure. Assume that the input consists entirely of escapes except for arbitrary (but non-null)
amounts of separating whitespace.
-q Be quiet. Do not chat unnecessarily.
-Z<format>
Convert input using the supplied format. The format specified will be used as the format string in
a call to sscanf(3) with a single argument consisting of a pointer to an unsigned long integer.
For example, to obtain the same results as with the -U flag, the format would be: \u%04X.
If the format is Quoted-Printable, although it is not strictly speaking conversion of an ASCII escape to
Unicode, in accordance with RFC 2045, if an equal-sign occurs at the end of an input line, both the
equal-sign and the immediately following newline are skipped.
All options that accept hexadecimal input recognize both upper- and lower-case hexadecimal digits.