Are there any CLI applications for UNIX that would allow me to merge / combine 2 or more wav files into one?

ffmpeg suite, the main converter/multiplexer/demux program is named ffmpeg.

Combining 2 avi data into one video DVD, i think of abode windows dvd maker won't be in a position to try this properly, via fact failed on my computing gadget, yet you're able to have a attempt via youself, possibly ok on your computing gadget, if nonetheless failed, i think of you could stick to me to purpose yet another extra helpful dvd writer application, like now i'm making use of RZ DVD writer, it could in advantageous condition/burn multiple video data into one DVD, it could promptly convert any formats video data to video dvd and burn to any dvd disc(DVD-R, DVD+R, DVD-RW, DVD+RW, DVD-R DL, DVD+R DL, etc), uncomplicated to apply, run RZ DVD writer, insert a dvd disc into your computing gadget dvd burner stress, promptly drag and drop your 2 avi data into the appliance, in case you view a message tip "source DVD length is larger than CD/DVD disc skill", you could press "particular", the appliance will automobile compress the video data to in advantageous condition the size of inserted dvd disc, finally press "start up" button, you will get one DVD action picture out of your 2 avi data, after which you would be able to play the blistered video DVD on DVD participant properly. you could yahoo or google seek and acquire RZ DVD writer, wish it could assist you to.