7. Operating on sorted files

These commands work with (or produce) sorted files.

7.1 sort: Sort text files		Sort text files.
7.2 uniq: Uniquify files		Uniquify files.
7.3 comm: Compare two sorted files line by line		Compare two sorted files line by line.
7.5 ptx: Produce permuted indexes		Produce a permuted index of file contents.
7.4 tsort: Topological sort		Topological sort.