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apropos

• intro (2) — introduction to system calls [man]

Ruby (ri)

• ActiveRecord::Migration::Compatibility::V4_2 — Ruby class/module
• ActiveRecord::Migration::Compatibility::V5_2 — Ruby class/module
• ActiveRecord::Migration::Compatibility::V4_2::TableDefinition — Ruby class/module
• ActiveRecord::Migration::Compatibility::V5_2::CommandRecorder — Ruby class/module
• ActiveRecord::Migration::Compatibility::V5_2::TableDefinition — Ruby class/module
• Net::SSH::Transport::HMAC::SHA2_256 — Ruby class/module
• Regexp::Syntax::V2_2_0 — Ruby class/module
• Regexp::Syntax::V2_6_2 — Ruby class/module
• Net::SSH::Transport::HMAC::SHA2_256_96 — Ruby class/module
• Net::SSH::Transport::HMAC::SHA2_256_Etm — Ruby class/module