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+.TH BIBTEXU "1" "30 August 2022" "bibtexu 4.00" "User Commands"
+.SH NAME
+bibtexu \- UTF-8 Big BibTeX
+.SH SYNOPSIS
+.B bibtexu
+[\fIoptions\fR] \fIaux-file\fR
+.SH DESCRIPTION
+.PP
+.B BibTeXu
+is the Unicode-compliant version of BibTeX.
+It is largely based on Niel Kempson's BibTeX8, and it provides
+a better support for UTF-8 by integrating ICU library.  Therefore,
+.B BibTeXu
+no longer requires the Codepage and Sort order ("CS") file; instead,
+the method of sorting and case-changing can be controlled via
+command-line options.
+.SH OPTIONS
+.TP
+\fB\-?\fR  \fB\-\-help\fR
+display some brief help text.
+.TP
+\fB\-d\fR  \fB\-\-debug\fR TYPE
+report debugging information.  TYPE is one
+or more of all, csf, io, mem, misc, search.
+.TP
+\fB\-s\fR  \fB\-\-statistics\fR
+report internal statistics.
+.TP
+\fB\-t\fR  \fB\-\-trace\fR
+report execution tracing.
+.TP
+\fB\-v\fR  \fB\-\-version\fR
+report BibTeX version.
+.TP
+\fB\-l\fR  \fB\-\-language\fR LANG
+use language LANG to convert strings to low case.
+This argument is passed to ICU library.
+.TP
+\fB\-o\fR  \fB\-\-location\fR LANG
+use language LANG for sorting.
+This argument is passed to ICU library.
+.TP
+\fB\-B\fR  \fB\-\-big\fR
+set large BibTeX capacity.
+.TP
+\fB\-H\fR  \fB\-\-huge\fR
+set huge BibTeX capacity.
+.TP
+\fB\-W\fR  \fB\-\-wolfgang\fR
+set really huge BibTeX capacity for Wolfgang.
+.TP
+\fB\-M\fR  \fB\-\-min_crossrefs\fR ##
+set min_crossrefs to ##.
+.TP
+\fB\-\-mstrings\fR ##
+allow ## unique strings.
+.SH UNICODE SUPPORT
+.PP
+.B BibTeXu
+supports extended features to handle Unicode characters.
+Several built-in functions in bibliography styles are enhanced as follows.
+.TP
+\fB&\fR
+Pops the top two (integer) literals and pushes their bitwise AND.
+.TP
+\fB|\fR
+Pops the top two (integer) literals and pushes their bitwise OR.
+.TP
+\fBadd.period$\fR
+Pops the top (string) literal, adds a `.' to it if the last non`}'
+character isn't a `.', `?', `!' or a Unicode punctuation mark and pushes this resulting string.
+The mark may be U+203C, U+203D, U+2047, U+2048, U+2049, U+3002, U+FF01, U+FF0E or U+FF1F.
+.TP
+\fBchr.to.int$\fR
+Pops the top (string) literal, makes sure it's a multibyte string of a single Unicode code point,
+converts it to the corresponding Unicode scalar value (integer), and pushes this integer.
+.TP
+\fBint.to.chr$\fR
+Pops the top (integer) literal, interpreted as the Unicode scalar value of a single code point,
+converts it to the corresponding single character multibyte string, and pushes this string.
+.TP
+\fBnum.names$\fR, \fBformat.name$\fR
+The function is the same as original BibTeX but
+an Ideographic/Fullwidth Comma (U+3001, U+FF0C) in addition to an " and " string is
+accepted as a sepalator between persons and
+Ideographic Space (U+3000) in addition to a space " " is accepted as a sepalator between a family name and a given name.
+.TP
+\fBsubstring$\fR, \fBtext.length$\fR, \fBtext.prefix$\fR
+The function is the same as original BibTeX but the unit of operand numbers is Unicode code point.
+.TP
+\fBchange.case$\fR
+The function is the same as original BibTeX but letters of
+non-english Latin, Greek and Cyrillic are supported.
+.TP
+\fBwidth$\fR
+The function is the same as original BibTeX but letters of Latin-1 and Latin Extended-A
+and CJK characters are supported.
+.TP
+\fBis.cjk.str$\fR
+Pops the top (string) literal, set flag bits to an integer if CJK characters are found in the string,
+and pushes the resulting integer, otherwise pushes 0.
+Flags 0x001, 0x002, 0x004, 0x008 and 0x800 are corresponding to Hanzi (Kanji, Hanja), Kana, Hangul,
+Bopomofo and other CJK characters, respectively.
+For example, an integer 0x003 will be pushed if Hanzi and Kana characters are found in a poped string literal.
+.TP
+\fBis.kanji.str$\fR
+Same as \fBis.cjk.str$\fR for compatibility with (u)pBibTeX.
+.SH SEE ALSO
+More detailed description of
+.B BibTeXu
+is available at $TEXMFDIST/doc/bibtexu/README.
+.SH AUTHORS
+.B BibTeXu 
+was written by Yannis Haralambous and his students.
+It is maintained as part of TeX Live.
+.PP
+This manpage was written for TeX Live.