/usr/bin/ldiff is in ruby-diff-lcs 1.1.3-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #!/usr/bin/env ruby
require 'diff/lcs'
require 'diff/lcs/ldiff'
exit Diff::LCS::Ldiff.run(ARGV)
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