1ERB(1)                 Ruby Programmers Reference Guide                 ERB(1)
2

NAME

4     erb — Ruby Templating
5

SYNOPSIS

7     erb [--version] [-UPdnvx] [-E ext[:int]] [-S level] [-T mode]
8         [-r library] [--] [file ...]
9

DESCRIPTION

11     erb is a command line front-end for ERB library, which is an implementa‐
12     tion of eRuby.
13
14     ERB provides an easy to use but powerful templating system for Ruby.
15     Using ERB, actual Ruby code can be added to any plain text document for
16     the purposes of generating document information details and/or flow con‐
17     trol.
18
19     erb is a part of Ruby.
20

OPTIONS

22     --version      Prints the version of erb.
23
24     -E external[:internal]
25     --encoding external[:internal]
26                    Specifies the default value(s) for external encodings and
27                    internal encoding. Values should be separated with colon
28                    (:).
29
30                    You can omit the one for internal encodings, then the
31                    value (Encoding.default_internal) will be nil.
32
33     -P             Evaluates lines starting with % as Ruby code and removes
34                    the tailing EOLs.
35
36     -S level       Specifies the safe level in which eRuby script will run.
37
38     -T mode        Specifies trim mode (default 0).  mode can be one of
39
40                          0       EOL remains after the embedded ruby script
41                                  is evaluated.
42
43                          1       EOL is removed if the line ends with %>.
44
45                          2       EOL is removed if the line starts with <%
46                                  and ends with %>.
47
48                          -       EOL is removed if the line ends with -%>.
49                                  And leading whitespaces are removed if the
50                                  erb directive starts with <%-.
51
52     -U             can be one of Sets the default value for internal encod‐
53                    ings (Encoding.default_internal) to UTF-8.
54
55     -d
56     --debug        Turns on debug mode.  $DEBUG will be set to true.
57
58     -h
59     --help         Prints a summary of the options.
60
61     -n             Used with -x.  Prepends the line number to each line in
62                    the output.
63
64     -v             Enables verbose mode.  $VERBOSE will be set to true.
65
66     -x             Converts the eRuby script into Ruby script and prints it
67                    without line numbers.
68

EXAMPLES

70     Here is an eRuby script
71
72           <?xml version="1.0" ?>
73           <% require 'prime' -%>
74           <erb-example>
75             <calc><%= 1+1 %></calc>
76             <var><%= __FILE__ %></var>
77             <library><%= Prime.each(10).to_a.join(", ") %></library>
78           </erb-example>
79
80     Command
81           % erb -T - example.erb
82     prints
83
84           <?xml version="1.0" ?>
85           <erb-example>
86             <calc>2</calc>
87             <var>example.erb</var>
88             <library>2, 3, 5, 7</library>
89           </erb-example>
90

SEE ALSO

92     ruby(1).
93
94     And see ri(1) documentation for ERB class.
95

REPORTING BUGS

97     Security vulnerabilities should be reported via an email to
98     ⟨security@ruby-lang.org⟩.  Reported problems will be published after
99     being fixed.
100
101     And you can report other bugs and feature requests via the Ruby Issue
102     Tracking System (http://bugs.ruby-lang.org).  Do not report security vul‐
103     nerabilities via the system because it publishes the vulnerabilities
104     immediately.
105

AUTHORS

107     Written by Masatoshi SEKI.
108
109UNIX                           November 7, 2012                           UNIX