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ttx

$ ttx
usage: ttx [options] inputfile1 [... inputfileN]

    TTX 2.5 -- From OpenType To XML And Back

    If an input file is a TrueType or OpenType font file, it will be
       dumped to an TTX file (an XML-based text format).
    If an input file is a TTX file, it will be compiled to a TrueType
       or OpenType font file.

    Output files are created so they are unique: an existing file is
       never overwritten.

    General options:
    -h Help: print this message
    -d <outputfolder> Specify a directory where the output files are
       to be created.
    -o <outputfile> Specify a file to write the output to. A special
       value of of - would use the standard output.
    -v Verbose: more messages will be written to stdout about what
       is being done.
    -q Quiet: No messages will be written to stdout about what
       is being done.
    -a allow virtual glyphs ID's on compile or decompile.

    Dump options:
    -l List table info: instead of dumping to a TTX file, list some
       minimal info about each table.
    -t <table> Specify a table to dump. Multiple -t options
       are allowed. When no -t option is specified, all tables
       will be dumped.
    -x <table> Specify a table to exclude from the dump. Multiple
       -x options are allowed. -t and -x are mutually exclusive.
    -s Split tables: save the TTX data into separate TTX files per
       table and write one small TTX file that contains references
       to the individual table dumps. This file can be used as
       input to ttx, as long as the table files are in the
       same directory.
    -i Do NOT disassemble TT instructions: when this option is given,
       all TrueType programs (glyph programs, the font program and the
       pre-program) will be written to the TTX file as hex data
       instead of assembly. This saves some time and makes the TTX
       file smaller.
    -z <format> Specify a bitmap data export option for EBDT:
       {'raw', 'row', 'bitwise', 'extfile'} or for the CBDT:
       {'raw', 'extfile'} Each option does one of the following:
         -z raw
            * export the bitmap data as a hex dump
         -z row
            * export each row as hex data
         -z bitwise
            * export each row as binary in an ASCII art style
         -z extfile
            * export the data as external files with XML references
       If no export format is specified 'raw' format is used.
    -e Don't ignore decompilation errors, but show a full traceback
       and abort.
    -y <number> Select font number for TrueType Collection,
       starting from 0.

    Compile options:
    -m Merge with TrueType-input-file: specify a TrueType or OpenType
       font file to be merged with the TTX file. This option is only
       valid when at most one TTX file is specified.
    -b Don't recalc glyph bounding boxes: use the values in the TTX
       file as-is.