Suppose I have the following files to group and merge, according to their filenames. How to do it on Ruby? P.S In BASH, you can merge two mp3 files perfectly with the cat command. # cat file1.mp3 file2.mp3 > file.mp3 01-01 Faithful Subjects.mp3 01-02 Faithful Subjects.mp3 01-03 Faithful Subjects.mp3 01-04 Faithful Subjects.mp3 01-05 Faithful Subjects.mp3 01-06 Faithful Subjects.mp3 01-07 Colonial Constitutions and Their Inspiration.mp3 01-08 Colonial Constitutions and Their Inspiration.mp3 01-09 Colonial Constitutions and Their Inspiration.mp3 01-10 Colonial Constitutions and Their Inspiration.mp3 01-11 Colonial Constitutions and Their Inspiration.mp3 01-12 Colonial Constitutions and Their Inspiration.mp3 02-01 blah blah blah.mp3 02-02 blah blah blah.mp3 etc... -- Posted via http://www.ruby-forum.com/.