Topological sort, perform a topological sort on the given FILE,
or standard input if no input file is given or for a FILE of `-'.
SYNTAX tsort [OPTION] [FILE] OPTIONS --help --version `tsort' reads its input as pairs of strings, separated by blanks, indicating a partial ordering. The output is a total ordering that corresponds to the given partial ordering. For example tsort <<EOF a b c d e f b c d e EOF will produce the output a b c d e f `tsort' will detect cycles in the input and writes the first cycle encountered to standard error.
"There is always room at the top" - Daniel
sort - Sort text files