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For example, if you need to make sure that a particular package is unmasked in /etc/portage/package.keywords/local, you can use string_replacer to put it there without disturbing the other lines.

installgem install string_replacer
Authors

Seamus Abshere

1,174 total downloads 1,174 for this version
Owners

B541e45c86f3b6213b6e87af0f537401

Gemfile
gem 'string_replacer', '~> 0.0.1'
Versions
  1. 0.0.1 September 22, 2010 (7 KB)