ERB(1)                1 (ruby programmer's reference guide)               ERB(1)

     erb – Ruby Templating

     erb [--version] [-UPdnvx] [-E ext[:int]] [-S level] [-T mode] [-r library]
         [--] [file ...]

     erb is a command line front-end for ERB library, which is an implementation
     of eRuby.

     ERB provides an easy to use but powerful templating system for Ruby.  Using
     ERB, actual Ruby code can be added to any plain text document for the
     purposes of generating document information details and/or flow control.

     erb is a part of Ruby.

     --version      Prints the version of erb.

     -E external[:internal]
     --encoding external[:internal]
                    Specifies the default value(s) for external encodings and
                    internal encoding. Values should be separated with colon

                    You can omit the one for internal encodings, then the value
                    (Encoding.default_internal) will be nil.

     -P             Disables ruby code evaluation for lines beginning with %.

     -S level       Specifies the safe level in which eRuby script will run.

     -T mode        Specifies trim mode (default 0).  mode can be one of

                          0       EOL remains after the embedded ruby script is

                          1       EOL is removed if the line ends with %>.

                          2       EOL is removed if the line starts with <% and
                                  ends with %>.

                          -       EOL is removed if the line ends with -%>.  And
                                  leading whitespaces are removed if the erb
                                  directive starts with <%-.

     -r             Load a library

     -U             can be one of Sets the default value for internal encodings
                    (Encoding.default_internal) to UTF-8.

     --debug        Turns on debug mode.  $DEBUG will be set to true.

     --help         Prints a summary of the options.

     -n             Used with -x.  Prepends the line number to each line in the

     -v             Enables verbose mode.  $VERBOSE will be set to true.

     -x             Converts the eRuby script into Ruby script and prints it
                    without line numbers.

     Here is an eRuby script

           <?xml version="1.0" ?>
           <% require 'prime' -%>
             <calc><%= 1+1 %></calc>
             <var><%= __FILE__ %></var>
             <library><%= Prime.each(10).to_a.join(", ") %></library>

           % erb -T - example.erb

           <?xml version="1.0" ?>
             <library>2, 3, 5, 7</library>


     And see ri(1) documentation for ERB class.

     •   Security vulnerabilities should be reported via an email to  Reported problems will be published after
         being fixed.

     •   Other bugs and feature requests can be reported via the Ruby Issue
         Tracking System (  Do not report security
         vulnerabilities via this system because it publishes the
         vulnerabilities immediately.

     Written by Masatoshi SEKI.

UNIX                            December 16, 2018                           UNIX