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ERB(1)                 Ruby Programmers Reference Guide                 ERB(1)

NAME
     erb - Ruby Templating

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

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

     eRuby provides an easy to use but powerful templating system for Ruby.  Using eRuby, 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.

OPTIONS
     --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 sep-
                    arated with colon (:).

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

     -P             Evaluates lines starting with % as Ruby code and removes the tailing EOLs.

     -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 evaluated.

                          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 <%-.

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

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

     -h
     --help         Prints a summary of the options.

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

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

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

EXAMPLES
     Here is an eRuby script

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

     Command
           % erb -T - example.erb
     prints

           <?xml version="1.0" ?>
           <erb-example>
             <calc>2</calc>
             <var>example.erb</var>
             <library>2, 3, 5, 7</library>
           </erb-example>

SEE ALSO
     ruby(1).

     And see ri(1) documentation for ERB class.

REPORTING BUGS
     Security vulnerabilities should be reported via an email to <securityATruby-lang.org>.  Reported problems will be
     published after fixed.

     And you can report other bugs and feature requests via the Ruby Issue Tracking System (http://redmine.ruby-
     lang.org).  Do not report security vulnerabilities via the system because it publishes the vulnerabilities imme-
     diately.

AUTHORS
     Written by Masatoshi SEKI.

UNIX                           December 27, 2008                          UNIX