Merge all pdf files in a folder into one file

When faced with a problem of printing more than 500 pdf files I thought why can't it be merged into one. I always do this merging in with 4 or 5 files. It was quite a daunting task then. Then I came upon this solution. Works like a charm.

Another post on auto mount in DosBox

Follow the link.

Too lazy to write a detailed post. 

Get list of files in a folder in Ubuntu

Needed a list of all files in a folder.

Found the suggestions here and here.

ls -R1 /Dir_Name_Here/ > output.txt

ls > file.txt

Both work just fine.