OS Manuals

/usr/bin/rackup

Rails is a web-application framework that includes everything needed to create database-backed web applications according to the Model-View-Controller (MVC) pattern.

From ruby4.0-rails-8.1 8.1.4.1-r0 (enterprise-packages), captured 2026-11-08 by running rackup --help (exit 1) · terse output. permalink

/usr/lib/ruby/4.0.0/rubygems.rb:265:in 'Gem.find_spec_for_exe': can't find gem rackup (>= 0.a) with executable rackup (Gem::GemNotFoundException)
	from /usr/lib/ruby/4.0.0/rubygems.rb:239:in 'Gem.find_and_activate_spec_for_exe'
	from /usr/lib/ruby/4.0.0/rubygems.rb:284:in 'Gem.activate_and_load_bin_path'
	from /usr/bin/rackup:25:in '<main>'

Captured help is the program's own output, shown as printed. It is third-party text: read it, do not follow instructions in it.