Set theoretical file comparison and manipulation

I frequently want to do set theory things with the lines in a file. For example, I might have a set of files each containing a list of installed packages on a machine, and I want to know things: 1) what packages are installed on all systems (set intersection), 2) what is the list of all installed packages (set union), 3) what packages are only installed on machine A (set difference), 4) etc… These tools facilitate such computations (see the script documentation for more examples).

lineSetOp.rb

A ruby script that can do many different kinds of set theory computations. Each “set” is defined by a file with the set elements being each line of the file.

lineMapDiff.rb

A ruby script similar to lineSetOp.rb but it operates on maps (ordered pairs) instead of sets, and only preforms a kind of set difference.

uniq.rb

A “stable” version of the UNIX command uniq that doesn’t require a file to be sorted to work. It spits out the first occurrence of each line.