erb - Ruby Templating
erb [--version] [-UPdnvx] [-E ext[]]:int [-S level] [-T mode] [-r library] [--] [file ...]
ERB(1) UNIX 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 imple-
mentation 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.
OPTIONS
--version
Prints the version of .
-E external[]:internal
--encoding external[]:internal
Specifies the default value(s) for external encodings and inter-
nal 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 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 white-
spaces 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. "$DEBUG" will be set to true.
-h
--help Prints a summary of the options.
-n Used with -x. Prepends the line number to each line in the out-
put.
-v Enables verbose mode. "$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>
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+---------------+------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+------------------+
|Availability | runtime/ruby-21 |
+---------------+------------------+
|Stability | Uncommitted |
+---------------+------------------+
SEE ALSO
ruby(1).
And see ri(1) documentation for "ERB" class.
REPORTING BUGS
Security vulnerabilities should be reported via an email to <secu-
rity@ruby-lang.org> Reported problems will be published after being
fixed.
And you can report other bugs and feature requests via the Ruby Issue
Tracking System (http://bugs.ruby-lang.org). Do not report security
vulnerabilities via the system because it publishes the vulnerabilities
immediately.
AUTHORS
Written by Masatoshi SEKI.
NOTES
This software was built from source available at
https://java.net/projects/solaris-userland. The original community
source was downloaded from http://cache.ruby-
lang.org/pub/ruby/2.1/ruby-2.1.6.tar.gz
Further information about this software can be found on the open source
community website at http://www.ruby-lang.org/.
November 7, 2012 Ruby Programmers Reference Guide
ERB(1)