Provided by: html-xml-utils_7.6-1_amd64
hxunent - replace HTML predefined character entities by UTF-8
hxunent [ -b ] [ -f ] [ file ]
The hxunent command reads the file (or standard input) and copies it to standard output with &-entities by their equivalent character (encoded as UTF-8). E.g., " is replaced by " and < is replaced by <.
The following options are supported: -b The five builtin entities of XML (< > " ' &) are not replaced but copied unchanged. This is necessary if the output has to be valid XML or SGML. -f This option changes how unknown entities or lone ampersands are handled. Normally they are copied unchanged, but this option tries to "fix" them by replacing ampersands by &. Often such stray ampersands are the result of copy and paste of URLs into a document and then this option indeed fixes them and makes the document valid.
The program's exit value is 0 if all went well, otherwise: 1 The input couldn't be read (file not found, file not readable...) 2 Wrong command line arguments.
The program assumes entities are as defined by HTML. It doesn't read a document's DTD to find the actual definitions in use in a document. With -f, it will even remove all entities that are not HTML entities.