LAsort [-v] align:las ...
Sort each .las alignment file specified on the command line. For each file it reads in all the overlaps in the file and sorts them in lexicographical order of (a,b,o,ab) assuming each alignment is recorded as a[ab,ae] x b^o[bb,be]. It then writes them all to a file named align.S.las (assuming that the input file was align.las). With the -v option set, the program reports the number of records read and written.