HTML Help files are made with help authoring tools. Microsoft ships the HTML Help Workshop with supported versions of Microsoft Windows and makes the tool available for free download. There are also a lot of third-party help authoring tools available.
CHM files, known as Microsoft Compressed HTML Help files, are a common format for eBooks and online documentation. They are basically a collection of HTML files stored in a compressed archive with the added benefit of an index.
Under Linux, you can view a CHM file with the xchm viewer. But sometimes that’s not enough. Suppose you want to edit, republish, or convert the CHM file into another format such as the Plucker eBook format for viewing on your Palm. To do so, you first need to extract the original HTML files from the CHM archive.
This can be done with the CHMLIB (CHM library) and its included helper application extract_chmLib.
Install Chmlib in Ubuntu
sudo apt-get install libchm-bin
Convert .chm files in to HTML files
If you want to convert .chm files in to HTML files use the following command
extract_chmLib book.chm outdir
where book.chm is the path to your CHM file and outdir is a new directory that will be created to contain the HTML extracted from the CHM file.
Convert .chm files in to PDF files
First you need to install htmldoc. HTML processor that generates indexed HTML, PS, and PDF.HTMLDOC is a program for writing documentation in HTML and producing indexed HTML, PostScript, or PDF output (with tables of contents). It supports most HTML 3.2 and some HTML 4.0 syntax, as well as GIF, JPEG, and PNG images.
sudo apt-get install htmldoc
If you want to use htmldoc type the following command in terminal
Once it opens you should see similar to the following screen here you can choose the html file and convert them to pdf,ps
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